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Recent questions tagged physics
Questions
Consider the following statements \[\] Statement 1: The energy of a charged particle does not change in spatially varying magnetic field \[\] Statement 2: The instantaneous work done by magnetic field is zero
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
motion-in-a-magnetic-field
medium
asked
Feb 25, 2014
by
thanvigandhi_1
1
answer
Consider the following statements \[\] Statement 1: The energy of a charged particle in a uniform magnetic field does not change \[\] Statement 2: Magnetic field does no work
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
motion-in-a-magnetic-field
easy
asked
Feb 25, 2014
by
thanvigandhi_1
1
answer
Infinitely long wires parallel to the $y$ - axis are present in the $x-y$ plane at $x = 1, x = 2, x = 4$, and so on. The currents in all the wires with odd serial no is $1A $ in the $+y$ direction while it is $1A$ in the $–y$ direction for all the wires with even serial no. The magnetic field at the origin would be
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
magnetic-field-due-to-long-wire
difficult
asked
Feb 25, 2014
by
thanvigandhi_1
1
answer
Masses of two isobars $\;_{29}^{64}Cu\;$ and $\;_{30}^{64}Zn\;$ are 63.9298n and 63.9292n respectively.It can be concluded from these data that
jeemain
physics
class12
atoms-and-nuclei
medium
asked
Feb 25, 2014
by
yamini.v
1
answer
A straight wire of length $\ell$ carries a current $i$. The magnitude of magnetic field at the point $P$ is
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
magnetic-field-due-to-long-current-wire
medium
asked
Feb 25, 2014
by
thanvigandhi_1
1
answer
A monochromatic radiation wavelength $\;\lambda_{1}\;$ is incident on a stationary atom as a result of which wavelength of photon after collision becomes $\;\lambda_{2}\;$ and recoiled atom has De- Broglie's wavelength $\;\lambda_{3}\;$.Then
jeemain
physics
class12
atoms-and-nuclei
medium
asked
Feb 25, 2014
by
yamini.v
1
answer
The ratio of de-Broglie wavelength of moleculus of hydrogen and helium in two gas jars kept separately at temperatures $\;27^{0} C\;$ and $\;127^{0} C\;$ respectively is
jeemain
physics
class12
unit11
electrostatics
difficult
asked
Feb 25, 2014
by
yamini.v
1
answer
The ratio of de-Broglie wavelength of a $\;\alpha\;$ particle to that of proton being subjected to same magnetic field so that the radii of their path are equal to each other assuming the field induction vector $\;\overrightarrow{B}\;$ is perpendicular to velocity vectors of $\;\alpha-\;$ particle and proton , is
jeemain
physics
class12
unit11
electrostatics
difficult
asked
Feb 25, 2014
by
yamini.v
1
answer
If a stationary electron gets annihilated due to association with a stationary positron (hypothetically), the wavelength of resulting radiation will be .
jeemain
physics
class12
unit11
electrostatics
medium
asked
Feb 25, 2014
by
yamini.v
1
answer
When a metallic surface is illuminated with monochromatic light of wavelength $\;\lambda\;$ and stopping potential for photo electron current is $\;3V_{0}\;$ . When some metallic surface is illuminated with a light of wavelength $\;2 \lambda\;$ , The stopping potentials is $\;V_{0}\;$ . The threshold wavelength for surface is
jeemain
physics
class12
unit11
electrostatics
medium
asked
Feb 25, 2014
by
yamini.v
1
answer
A photon of wavelength $\;5030 A^{0}\;$ is incident on a totally reflecting surface. The momentum delivered by photon is equal to
jeemain
physics
class12
unit11
electrostatics
medium
asked
Feb 25, 2014
by
yamini.v
1
answer
A star initially has $\;10^{40}\;$ deutrons . If produces energy via the process $\;_{1}H^{1}+_{1}H^{2} \to _{1}H^{3}+P\;$ and $\;_{1}H^{2}+_{1}H^{3} \to _{2}He^{4}\;.$ If the average power radiated by star is $\;10^{16}W\;,$ the deutron supply of star is exhausted in a time of order of \[\] (The masses of nuclei are $\;m(H^2)=2.014\;amu\;,m(p)=1.007 amu , \; m(n)=1.0084 amu ,\; m(H)=4.001 amu))$
jeemain
physics
class12
unit11
electrostatics
difficult
asked
Feb 25, 2014
by
yamini.v
1
answer
Binding energy per nucleon vs mass no . Curve for nuclei is shown in figure. W,X,Y,Z are four nuclei indicated on curve . The process that would release energy is
jeemain
physics
class12
atoms-and-nuclei
difficult
asked
Feb 24, 2014
by
yamini.v
1
answer
The weight based ratio of $\;U^{238}\;$ and $\;Pb^{226}\;$ in a sample of rock is 413 . if the half life of $\;u^{238}\;$ is $\;4.5 \times10^{9}\;years \;,$ then age of rock is
jeemain
physics
class12
atoms-and-nuclei
medium
asked
Feb 24, 2014
by
yamini.v
1
answer
A hydrogen atom is in an excited state of principal quantaum number$\; (n)\;$ it emits a photon of wavelength $\;(\lambda)\;,$ when it returns to ground state . The value of n is
jeemain
physics
class12
atoms-and-nuclei
medium
asked
Feb 24, 2014
by
yamini.v
1
answer
There are two radioactive substance A and B . Decay constant of B is two times that of A . Initially both have equal no.of nuclei . After n Lay liver of A rate of disintegration of both are equal . The value of n is
jeemain
physics
class12
atoms-and-nuclei
medium
asked
Feb 24, 2014
by
yamini.v
1
answer
If stationary proton and $\;\alpha-\;$ particle dre accelerated through same potential difference , the ratio of Debrogle's wavelength will be
jeemain
physics
class12
atoms-and-nuclei
difficult
asked
Feb 24, 2014
by
yamini.v
1
answer
The wavelength of $\;K_{\alpha}\;$ X-ray produced by X-ray to be is 0.76$A^{0}\;$. The atomic no.of anticathode material is
jeemain
physics
class12
atoms-and-nuclei
difficult
asked
Feb 24, 2014
by
yamini.v
1
answer
The ratio of minimum to maximum wavelengths of radiation that an electron cause in Bohr's hydrogen atom is
jeemain
physics
class12
unit11
electrostatics
medium
asked
Feb 24, 2014
by
yamini.v
1
answer
Radio isotopes of phosphorous $\;P^{32}\;$ and $\;P^{35}\;$ are mixed in ratio of 2:1 of atoms .The activity of samples 2 $\;\mu Ci\;$.Find activity of sample after 30 days. $\;t_{\large\frac{1}{2}}\;$ of $\;P^{32}=14\;$days and $\;t_{\large\frac{1}{2}}\;$ of $\;P^{33}\;$ is 25 days.
jeemain
physics
class12
atoms-and-nuclei
difficult
asked
Feb 24, 2014
by
yamini.v
1
answer
The mean lives of an radio active substance are 1620 and 405 years for $\;\alpha-\;$emission and $\;\beta-\;$ emission respee. Find out time during which three fourth of a sample will decay if it is decaying both the $\;\alpha-\;$emission and $\;\beta-\;$ emission simultaneously
jeemain
physics
class12
atoms-and-nuclei
medium
asked
Feb 24, 2014
by
yamini.v
1
answer
It is proposed to use nuclear fusion reaction : $\; _{1}H^{2}+_{1}H^{2}=\;_{2}He^{4}\;$ in a nuclear reactor of 200MW rating . If energy from above reaction is used with a $\;25 \%\;$ efficiency in reactor how many gr ams of deuterium will be needed per day . (The masses of $\;_{1}H^{2}\;$ and $\;_{2}He^{4}\;$ are 2.0141 & 4.0026 amu respectively
jeemain
physics
class12
atoms-and-nuclei
difficult
asked
Feb 24, 2014
by
yamini.v
1
answer
uranium ores on earth at present time typically have a composition of $\;99.3 \%$ of isotope $\;_{92}U^{238}\;$ and $\;0.7 \%\;$ of isotope $\;_{92}U^{235}\;$. The half lives of these isotopes are $\;4.47 \times10^{9}y\;$ and $\;7.04\times10^{8}y\;$ respectively . If these isotopes were equally abundent when the earth was formed , estimate the age of earth .
jeemain
physics
class12
atoms-and-nuclei
medium
asked
Feb 24, 2014
by
yamini.v
1
answer
The activity of a radiooctine sample is measured as 4750 counts/min at $\;t=0\;$ and as 2700 counts/min at $\;t=5$ minutes . Calculate Lay life of sample
jeemain
physics
class12
unit11
electrostatics
difficult
asked
Feb 24, 2014
by
yamini.v
1
answer
A deuterium reaction that occurs in an experimental fusion reactor is in two stapes \[\] (1) Two deuterium nucli fuse together to form a tritium nucleus , with a proton as a by-product written as $\; 1 > (D ,P)\; T\;.$ \[\] (2) A tritium nucleus fuses with another oleunterium nucleus to form a helium $\;_{2}He^{4}\;$ nucleus with neutron as a-by-product written as $\;T (D,n)\;_{2}He^{4}\;.$ Then the energy released in each of two stages and energy released in combined reaction is \[\] Given \[\] $\;_{1}D^{2}=2.014102\;a.m.u $ \[\] $\;_{1}T^{3}=3.016049\;a.m.u$ \[\] $\;_{1}H^{1}=1.007825\;a.m.u$ \[\] $\;_{1}n^{1}=1.008665\;a.m.u$\[\] The energy released per deuterium nuclei is
jeemain
physics
class12
unit11
electrostatics
medium
asked
Feb 24, 2014
by
yamini.v
1
answer
A deuterium reaction that occurs in an experimental fusion reactor is in two stapes \[\] (1) Two deuterium nucli fuse together to form a tritium nucleus , with a proton as a by-product written as $\; 1 > (D ,P)\; T\;.$ \[\] (2) A tritium nucleus fuses with another oleunterium nucleus to form a helium $\;_{2}He^{4}\;$ nucleus with neutron as a-by-product written as $\;T (D,n)\;_{2}He^{4}\;.$ Then the energy released in each of two stages and energy released in combined reaction is \[\] Given \[\] $\;_{1}D^{2}=2.014102\;a.m.u $ \[\] $\;_{1}T^{3}=3.016049\;a.m.u$ \[\] $\;_{1}H^{1}=1.007825\;a.m.u$ \[\] $\;_{1}n^{1}=1.008665\;a.m.u$
jeemain
physics
class12
unit11
electrostatics
medium
asked
Feb 24, 2014
by
yamini.v
1
answer
Consider the following statements \[\] Statement 1: A solenoid tends to expand when a current passes through it \[\] Statement 2: Two parallel metallic wires carrying current in the same direction repel each other
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
solenoid-and-toroid
easy
asked
Feb 23, 2014
by
thanvigandhi_1
1
answer
Consider the following statements. Assume the given field to be non-intersecting \[\] Statement 1: Given a field, it is always possible to construct current elements having the magnetic field similar to the given field \[\] Statement 2: Given a field, it is always possible to construct charge distributions having the electric field similar to the given field
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
motion-in-a-magnetic-field
difficult
asked
Feb 23, 2014
by
thanvigandhi_1
1
answer
A square loop of side $a$ carrying a current $i_1$ is kept at a distance of $a$ from an infinite wire carrying a current $i_2$ as shown. The torque on the loop is
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
force-between-two-parallel-current
medium
asked
Feb 23, 2014
by
thanvigandhi_1
1
answer
A rectangular loop carrying a current is situated near a long straight wire as shown. If a current $i$ now starts flowing through the wire, the loop will
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
force-between-parallel-currents
easy
asked
Feb 23, 2014
by
thanvigandhi_1
1
answer
A conducting wire bent in the form of a parabola $y^2 = 2x$ for $0 \leq x \leq 2$, carries a current $i = 1A$ in anti- clockwise direction as looked from above the $x-y$ plane. There exists uniform magnetic field $-2 \hat k$ Tesla in the region. The magnetic force on the wire is
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
force-on-current-wire-in-magnetic-field
difficult
asked
Feb 23, 2014
by
thanvigandhi_1
1
answer
A particle of specific charge (charge/mass) α starts moving from the origin under the action of an electric field $E_0 \hat i$ and a magnetic field $B_0 \hat k$ . Its velocity at $(x_0, 0, 0)$ is $4 \hat i + 3 \hat j$. The value of $ x_0$ is
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
motion-in-combined-electric-and-magnetic-field
medium
asked
Feb 23, 2014
by
thanvigandhi_1
1
answer
A current carrying wire $PQ$ is placed $ \perp$ to another wire $RS$ carrying a constant current. If the second wire is free to move, it will have
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
force-between-two-current-wires
medium
asked
Feb 23, 2014
by
thanvigandhi_1
1
answer
A metallic wire is folded to form a square loop of side $a$. It carries a current $i$ and is kept $ \perp$ to a uniform magnetic field. If the shape of the loop is changed from a square to a circle without changing its length or current, the amount of work done is
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
motion-in-a-magnetic-field
medium
asked
Feb 23, 2014
by
thanvigandhi_1
1
answer
A particle having charge $q$ enters a region of uniform magnetic field $B$ directed inwards and is deflected as shown to a distance $d$ above the original line of flight as shown. What is the (magnitude of) momentum of the particle?
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
motion-in-a-magentic-field
difficult
asked
Feb 23, 2014
by
thanvigandhi_1
1
answer
An electron moving with a speed $u$ along the $+ve\: x$ - axis and at $y = 0$ enters a region of uniform magnetic field $\overrightarrow B = -B_0 \hat k $ after sometime with speed $v$ at co-ordinate $ y$, then which exists to the right of the $ y$ - axis. The electron exits from the region
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
motion-in-a-magnetic-field
easy
asked
Feb 23, 2014
by
thanvigandhi_1
1
answer
Velocity and acceleration vector of a charged particle moving in a magnetic field at some instant are $ \overrightarrow V = 3\hat i + 4\hat j\: and\: \overrightarrow B= 2\hat i + x \hat j$. Select the incorrect alternative
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
motion-in-a-magnetic-field
medium
asked
Feb 23, 2014
by
thanvigandhi_1
1
answer
How much energy must a bombarding proton possess to cause the reaction ? $\;^{7}H_{3}+^{1}H_{1} \to _{4} Be^{7}+_{0}n^{1}$
jeemain
physics
class12
atoms-and-nuclei
difficult
asked
Feb 23, 2014
by
yamini.v
1
answer
Two identical coils are placed coaxially. They carry equal currents in the same direction. Then
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
magnetic-field-axis-of-circular-current-loop
easy
asked
Feb 23, 2014
by
thanvigandhi_1
1
answer
The binding energy of $\;_{17}cl^{35}\;$ nucleus is 298 HeV . Find its atomic mass $\;(_{1}H^{1})\;$ is 1.008143 a.m.u and that of a neutron is 1.008986 a.m.u . Given $\;1amu=931 MeV\;$
jeemain
physics
class12
atoms-and-nuclei
medium
asked
Feb 23, 2014
by
yamini.v
1
answer
A rigid circular loop of radius $ r$ lies in the $x-y$ plane on a flat table and a current $i$ flows through it. At this place, the earth’s magnetic field is $B_x\hat i + B_z \hat k$ . The value of $i$ so that one end of the loop lifts up from the table is
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
magnetic-feild-on-axis-of-circular-current-loop
medium
asked
Feb 23, 2014
by
thanvigandhi_1
1
answer
A conducting rod of mass $m$ and length $L$ is moving down a smooth incline plane on inclination $ \theta$ with constant velocity $ v$. A current $i$ is flowing in the conductor in a direction perpendicular to the paper inwards. A vertically upward magnetic field $ \overrightarrow B$ exists in space. Its magnitude is
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
motion-in-a-magentic-field
medium
asked
Feb 23, 2014
by
thanvigandhi_1
1
answer
Where $\;0.5 A^{0}\;$ x-rays strike a material , the photoelectrons from K shell are observed to move in a circle of radius 23mm in a magnetic fields of $\;2\times10^{-2}T\;.$ Than the binding energy of K-shell electrons is
jeemain
physics
class12
atoms-and-nuclei
difficult
asked
Feb 23, 2014
by
yamini.v
1
answer
The dimensions of $ \large\frac{B^2C^2R^2}{2\mu_0}$ where $B$ is magnetic field,$ R$ is resistance and $ C$ is capacitance are
jeemain
aipmt
physics
cbse
class12
ch4
ch5
magnetism-and-matter
difficult
asked
Feb 23, 2014
by
thanvigandhi_1
1
answer
Magnetic field at the centre of a circular loop of area $A$ is $B$. Then magnetic moment of the loop is
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
magnetic-field-axis-of-circular-current-loop
easy
asked
Feb 23, 2014
by
thanvigandhi_1
1
answer
A proton, a deuteron and an $ \alpha$ - particle having the same kinetic energy are moving in circular trajectories in a constant magnetic field. If $r_p, r_d$ and $r_{\alpha}$ denote respectively the radii of the trajectories of these particles, then
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
motion-in-a-magnetic-field
easy
asked
Feb 23, 2014
by
thanvigandhi_1
1
answer
A battery is connected between two points $A$ and $B$ on the circumference of a uniform conducting ring of radius $r$ and resistance $R$. One of the arcs $AB$ of the ring subtends an angle $ \theta$ at the centre. The intensity of the magnetic field at the centre due to a constant current in the ring is
jeemain
aipmt
physics
cbse
class12
ch4
moving-charge-and-magnetism
magnetic-field-on-axis-of-circular-current-loop
difficult
asked
Feb 23, 2014
by
thanvigandhi_1
1
answer
If the $\;K_{\alpha}\;$ radiation of $\;M_{0}\;(Z=42)\;$ has a wavelength of $\;0.71 A^{0}\;$ , than the wavelength of corresponding radiation of Cu , i. e , $\;K_{\alpha}$ for Cu $\;(z=29)\;$ assuming $\;\sigma=1\;$ .
jeemain
physics
class12
atoms-and-nuclei
difficult
asked
Feb 22, 2014
by
yamini.v
1
answer
A perfectly reflecting solid sphere of radius r is kept in the path of a parallel beam of light of large aperture . If the beam carries an intensity I find force exerted by beam on sphere .
jeemain
physics
class12
atoms-and-nuclei
difficult
asked
Feb 22, 2014
by
yamini.v
1
answer
A plate of mass 10gm is in equilibrium in air due to force exerted by light beam on plate . Assuming plate is perfectly absorbing the power of beam is :
jeemain
physics
class12
atoms-and-nuclei
difficult
asked
Feb 22, 2014
by
yamini.v
1
answer
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