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Recent questions tagged physics
Questions
An electrical charge $\;4\times10^{-8} C\;$ is placed at the point $\;(2 ,3 ,5)\;.$ At the point $\;(5 , 3, 1) m \;$ electric field vector will be
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
electric-field
medium
asked
Feb 6, 2014
by
yamini.v
1
answer
If the potential at the centre of a uniformly charged hollow sphere of radius R is V then electric field at a distance r from the centre of sphere will be $\;(r > R)$
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatics-of-conductors
medium
asked
Feb 6, 2014
by
yamini.v
1
answer
Find the magnitude of net electric field at the centre of square having charges arranged as shown in figure
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
force-between-multiple-charges
medium
asked
Feb 6, 2014
by
yamini.v
1
answer
The potential at a point x due to some charges situated on the x- axis is given by $\;V (x) = \large\frac{20}{(x^2-4)} volt\;$. The electric field at x = 4m is given by
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatic-potential
medium
asked
Feb 6, 2014
by
yamini.v
1
answer
A charge particle 'q' is shot towards another charged particle 'Q' which is fixed , with a speed 'v'.It approaches 'Q' upto a closest distance r and then returns . If q were given a speed of '2v' the closest distance of approach would be
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatic-potential-energy-of-a-system-of-charges
medium
asked
Feb 6, 2014
by
yamini.v
1
answer
Charge Q is given a displacement $\;\overrightarrow{r}=a \hat{i} + b \hat{j}\;$ in an electric field $\;\overrightarrow{E}=E_{1} \hat{i} + E_{2} \hat{j}\;.$ The work done is
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
electric-field
medium
asked
Feb 6, 2014
by
yamini.v
1
answer
Two thin wire rings each having radius R are placed at a distance d apart with their axes coinciding . The charges on the two rings are +Q and -Q .The potential difference between the centres of the two rings is
jeemain
physics
class12
unit11
electrostatics
medium
asked
Feb 6, 2014
by
yamini.v
1
answer
There is an electric field E in x - direction . If the work done on moving a charge of 0.2C through a distance of 2m along a line making an angle $\;60_{0}\;$ with x - axis is 4J . What is value of E
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
electric-field
medium
asked
Feb 6, 2014
by
yamini.v
1
answer
A charged particle of mass 100g and charge $\;10^{-3} C\;$ is suspended through a thread . A horizontal electric field $\; E=\sqrt{3}\times10^{3} NC^{-1}\;$ exists in region . Find the angle made by thread with verticle .
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
electric-field
medium
asked
Feb 6, 2014
by
yamini.v
1
answer
Which of the following does not represent Charle's law?
charles-law
easy
jeemain
physics
kinetic-theory-of-gases
class11
ch13
behaviour-of-gases
ideal-gas-law
asked
Feb 5, 2014
by
balaji
1
answer
Which of the following does not represent Boyle's law?
boyles-law
easy
jeemain
physics
kinetic-theory-of-gases
class11
ch13
behaviour-of-gases
ideal-gas-law
asked
Feb 5, 2014
by
balaji
3
answers
An oxide of nitrogen at NTP has a density equal to another oxide of Nitrogen at $12^{\circ}$. If we consider pressure conditions to be the same, what are the two oxides involved?
molecular-nature-of-matter
jeemain
physics
kinetic-theory-of-gases
class11
ch13
behaviour-of-gases
ideal-gas-law
medium
asked
Feb 5, 2014
by
balaji
1
answer
In the adjoining infinite circuit, what is the effective resistance as seen by the battery
jeemain
physics
current-electricity
cbse
class12
ch4
equivalent-resistance
difficult
asked
Feb 5, 2014
by
thanvigandhi_1
1
answer
At $0^{\circ}$, the density of carbon-di-oxide is the same as that of an oxide of nitrogen. The oxide of nitrogen is which of the following, considering the pressure conditions to be the same?
molecular-nature-of-matter
jeemain
physics
kinetic-theory-of-gases
class11
ch13
behaviour-of-gases
ideal-gas-law
easy
asked
Feb 5, 2014
by
balaji
1
answer
In a closed container, if we increase the temperature of the vessel, the pressure also increases due to:
jeemain
physics
kinetic-theory-of-gases
medium
kinetic-theory-of-an-ideal-gas
pressure-of-an-ideal-gas kinetic-interpretation-of-temperature
speed-of-molecules
class11
ch13
asked
Feb 5, 2014
by
balaji
1
answer
A charge Q is to be divided on two objects . What should be the values of the charges on the objects so that the force between the objects can be maximum
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
coulomb-law
medium
asked
Feb 5, 2014
by
yamini.v
1
answer
According to Maxwell's distribution of velocities, with an increase in temperature, which of the following is true?
jeemain
physics
kinetic-theory-of-gases
medium
kinetic-theory-of-an-ideal-gas
kinetic-interpretation-of-temperature
class11
ch13
speed-of-molecules
asked
Feb 5, 2014
by
balaji
1
answer
To double the full scale reading of any galvanometer turned into a voltmeter, you must
jeemain
physics
current-electricity
cbse
class12
ch4
meter-bridge-and-potentiometer-instrumentation
difficult
asked
Feb 5, 2014
by
thanvigandhi_1
1
answer
The electric field in a region is radially outward with magnitude $E=A\;r\;$ . Find the charge contained in a sphere of radius a centered at the origin . Take $\;A=90\;Vm^{-2}\;$ and $\;a = 2m\;$
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
electric-flux-and-dipole
medium
asked
Feb 5, 2014
by
yamini.v
1
answer
The value of each of the resistors is R. The equivalent resistance between A and B is
jeemain
physics
current-electricity
cbse
class12
ch4
equivalent-resistance
easy
asked
Feb 5, 2014
by
thanvigandhi_1
1
answer
A thin metallic spherical shell contains a charge Q on it . A point charge q is placed at the centre of the shell and another charge $\;q_{1}\;$ is placed outside it as shown in figure . All the three charges are +ve . The force on the charge at centre is
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
force-between-multiple-charges
medium
asked
Feb 5, 2014
by
yamini.v
1
answer
Two identical particles , each having a charge of $\;2\times10^{-4}\;C\;$ and mass 10g are kept at a separation of 10 cm and released . What would be the speeds of the particles when the separation becomes large ?
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatic-potential-energy-of-a-system-of-charges
medium
asked
Feb 5, 2014
by
yamini.v
2
answers
A particle having a charge of $\;2 \mu C\;$ is placed directly below and at a separation of 10 cm from the bob of a simple pendulum at rest . What charge should the bob be given so that the string becomes loose ? mass of the bob is 1 kg .
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
coulomb-law
medium
asked
Feb 5, 2014
by
yamini.v
1
answer
The electric field and the electric potential at a point are E and V respectively
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatic-potential
easy
asked
Feb 5, 2014
by
yamini.v
1
answer
A point charge q is rotated along a circle in the electric field generated by another point charge Q . The work done by the electric field on the rotating charge in one complete revolution is
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatic-potential
medium
asked
Feb 5, 2014
by
yamini.v
1
answer
Two charged particles having charge $\;2.0\times10^{-8}\;C\;$ each are joined by an insulating string of length 1m and the system is kept on smooth horizontal table . Find the tension in the string
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
coulomb-law
medium
asked
Feb 5, 2014
by
yamini.v
1
answer
Electric potential has the dimensions of
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatic-potential
medium
asked
Feb 5, 2014
by
yamini.v
1
answer
Electric potential on the surface of a solid sphere of radius R is V . Then potential at $\;r=\large\frac{R}{2}\;$ is
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatics-of-conductors
medium
asked
Feb 5, 2014
by
yamini.v
1
answer
A charge Q is placed at each of the two opposite corners of a square . A charge q is placed at each of the other two corners . If the resultant force on each charge q is zero , then
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
force-between-multiple-charges
medium
asked
Feb 5, 2014
by
yamini.v
1
answer
Four charges q , -q , q , -q are placed in order on the four consecutive corners of a square of side a . The work done in interchanging the positions of any two neighbouring charges of the opposite sign is
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatic-potential-energy-of-a-system-of-charges
medium
asked
Feb 5, 2014
by
yamini.v
1
answer
The electric field in a region is given by $\;\overrightarrow{E}=\large\frac{\in_{0} x \hat{i}}{l}\;.$ Find the charge contained inside a cubical volume bounded by the surfaces $\;x=0 , x=a , y=0 , y=a , z=0 , z=a $ where $a= 10^{-2} m$ and $l= 2 \times 10^{-2}\; m$
jeemain
physics
class12
unit11
electrostatics
medium
asked
Feb 5, 2014
by
yamini.v
1
answer
A point charge Q is located on the axis of a disc is radius R at a distance b from the plane of the disc . Find the electric flux through the disc if R= $\;\sqrt{3}\;b$
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
electric-flux-and-dipole
medium
asked
Feb 5, 2014
by
yamini.v
1
answer
The electrical potential existing in space is $\;V\;(x , y, z) = A\;(xy+yz+zx)\;$ . Find the expression for the electric field
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatic-potential
medium
asked
Feb 5, 2014
by
yamini.v
1
answer
A particle with kinetic energy $\;10\;MeV\;$ and charge $\;4e\;$ is heading towards a stationary nucleus of atomic number 100 . Calculate the distance of closest approach ?
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatic-potential-energy-of-a-system-of-charges
medium
asked
Feb 4, 2014
by
yamini.v
1
answer
A charged particle of mass $\;m= 1 kg\;$ and charge $\;q=2\;\mu C\;$ is thrown from a horizontal ground at an angle $\;\theta=45^{0}\;$ with speed $\;20\;m/s\;.$ In space a horizontal electric field $E=2\times10^{6}\;V/m\;$ exist Find the range on horizontal ground of the projectile
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
electric-field
difficult
asked
Feb 4, 2014
by
yamini.v
1
answer
A charge q is distributed uniformly on the surface of a sphere of radius R . It is covered by a concentric hollow conducting sphere of radius 2R . Find the charges on the outer surface of hollow sphere if it is earthed
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatic-potential
medium
asked
Feb 4, 2014
by
yamini.v
1
answer
Find the potential on the edge of a disc of charge density $\;\sigma$ and radius $R$
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatics-of-conductors
difficult
asked
Feb 4, 2014
by
yamini.v
1
answer
A disc having a uniform charge density $\;\sigma\;$ and radius $\;R\;$ is placed on $\;x-y\;$ plane with centre at the origin . Find the electric potential at a point on z - axis at a distance $\;10 m\;$ from centre . $\;\sigma=16\;\in_{0}\;,R=1 m$
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatics-of-conductors
medium
asked
Feb 4, 2014
by
yamini.v
1
answer
Two point charges $\;q_{1}=q_{2}=2\;\mu C\;$ are fixed at $\;x_{1}= +3m \;and\;x_{2}=-3m\;$ as shown in figure . A third particle of mass 1g and charge $\;q_{3}=-4\;\mu C\;$ are released from rest at $\;y=4m \;$. Find the speed of the particle as it reaches the origin .
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatic-potential-energy-of-a-system-of-charges
medium
asked
Feb 4, 2014
by
yamini.v
1
answer
The electric field in a region is given by $\;\overrightarrow{E}=\alpha\;x^2 \hat{i}\; $ Here $\;\alpha\;$ is a constant of proper dimensions . Find the total flux passing through a cube bounded by the surfaces . $x=l\;,x=2l\;,y=0\;,y=-l\;,z=0\;,z=l\;.$
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
electric-flux-and-dipole
medium
asked
Feb 4, 2014
by
yamini.v
1
answer
Thirteen resistors each of resistance R are connected in the circuit as shown. What sis the effective resistance between A and B?
jeemain
physics
current-electricity
cbse
class12
ch4
equivalent-resistance
difficult
asked
Feb 4, 2014
by
thanvigandhi_1
1
answer
The equivalent resistance between the points A and B is
jeemain
physics
current-electricity
cbse
class12
ch4
equivalent-resistance
difficult
asked
Feb 4, 2014
by
thanvigandhi_1
1
answer
A uniform electric field of 100 V/m is directed at $30^{0}$ with the +ve x - axis as shown in figure . Find the potential difference $\;V_{BA}\;$ if OA=2 m and OB= 4 m
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatic-potential
medium
asked
Feb 4, 2014
by
yamini.v
1
answer
Two identical balls having a mass m and small radii and having equal charge q are suspendended from common point by two insulating strings of equal length l . In equilibrium each string makes an angle $\;\theta\;$ with the vertical . If $\;\theta=45^{0}\;find\;l^2$ in terms of q and m
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
coulomb-law
medium
asked
Feb 4, 2014
by
yamini.v
1
answer
In the given circuit, the current through the battery is independent of $R_6$. Then which of these relation holds
jeemain
physics
current-electricity
cbse
class12
ch4
kirchoffs-law-wheatstone-bridge
easy
asked
Feb 3, 2014
by
thanvigandhi_1
1
answer
The equivalent resistance between the terminals A and D of the following circuit is:
jeemain
physics
current-electricity
cbse
class12
ch4
equivalent-resistance
medium
asked
Feb 3, 2014
by
thanvigandhi_1
1
answer
A metallic wire of resistance 12$ \Omega $ is bent to form a square. The effective resistance between two diagonal points would be
jeemain
physics
current-electricity
cbse
class12
ch4
equivalent-resistance
easy
asked
Feb 3, 2014
by
thanvigandhi_1
1
answer
In the circuit shown, the steady state potential drop across the capacitor must be
jeemain
physics
current-electricity
cbse
class12
ch4
kirchoffs-law-wheatstone-bridge
medium
asked
Feb 3, 2014
by
thanvigandhi_1
1
answer
In the circuit shown, the current passing through the:
jeemain
physics
current-electricity
cbse
class12
ch4
equivalent-resistance
medium
asked
Feb 3, 2014
by
thanvigandhi_1
1
answer
As the temperature of the conductor increases, the ratio of resistivity to conductivity
jeemain
physics
current-electricity
cbse
class12
ch4
electric-current-concepts
easy
asked
Feb 3, 2014
by
thanvigandhi_1
1
answer
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