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CBSE XII
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Physics
Physics
Electric charges and fields
Electrostatic Potential and Capacitance
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At a certain location in Africa , a component points $12^{\circ}$ west of the geographic north. The north tip of the magnetic needle of a dip circle placed in the plane of magnetic meridian points $60^{\circ}$ and above the horizontal. The horizontal component of the earth's field is measured to be $0.16 \;G$ Specify the direction and magnitude of the earth's field at the location .
cbse
class12
physics
ch-5
sec-a
q26
ncert
medium
asked
Jul 13, 2015
by
meena.p
1
answer
A magnetic needle free to rotate in a vertical plane parallel to the magnetic meridian has its north tip pointing down at $22^{\circ}$ with the horizontal. The horizontal component of the earth's magnetic field at the plane is known to be $0.35 \;G$ . Determine the magnetic of the earth's magnetic field at the place.
cbse
class12
physics
ch-5
sec-a
q25
ncert
medium
asked
Jul 13, 2015
by
meena.p
1
answer
A circular coil of 16 turns and radius $10\;cm$ carrying a current of $0.75 \;A$ rests with its plane normal to an external field of magnitude $5.0 \times 10^{-2}\;T$ The coil is free to turn about an axis in its plane perpendicular to the field direction , When the coil is turned slightly and released it oscillates about its stable equilibrium with a frequency of $2.0 m/s$ . What is the moment of inertia of the coil about its axis of rotation ?
cbse
class12
physics
ch-5
sec-a
q24
ncert
medium
asked
Jul 13, 2015
by
meena.p
1
answer
A closely wound solenoid of $2000$ turns and area of cross section $1.6 \times 10^{-4}m^2$, carrying a current of $4.0\;A$ is suspended through its center allowing it to turn in a horizontal plane. What are the force and torque on the solenoid, if a uniform horizontal magnetic field of $7.5 \times 10^{-2}\;T$ is setup at an angle of $30^{\circ}$ with the axis of solenoid ?
cbse
class12
physics
ch-5
sec-a
q23
ncert
medium
asked
Jul 13, 2015
by
meena.p
1
answer
A closely wound solenoid of $2000$ turns and area of cross section $1.6 \times 10^{-4}m^2$, carrying a current of $4.0\;A$ is suspended through its center allowing it to turn in a horizontal plane. What is the magnetic moment associated with the solenoid ?
cbse
class12
physics
ch-5
sec-a
q22
ncert
medium
asked
Jul 10, 2015
by
meena.p
1
answer
A bar magnet of magnetic moment $1.5\;J/T$ lies aligned with the direction of a uniform magnetic field of $0.22\;T$ What is the amount of work required by an external torque to turn the magnet so as to align its magnetic moment, opposite to the field direction ?
cbse
class12
physics
ch-5
sec-a
q21
ncert
medium
asked
Jul 10, 2015
by
meena.p
1
answer
A bar magnet of magnetic moment $1.5\;J/T$ lies aligned with the direction of a uniform magnetic field of $0.22\;T$ What is the torque on the magnet when the magnet aligns normal to the field direction ?
cbse
class12
physics
ch-5
sec-a
q20
ncert
medium
asked
Jul 10, 2015
by
meena.p
1
answer
A bar magnet of magnetic moment $1.5\;J/T$ lies aligned with the direction of a uniform magnetic field of $0.22\;T$ What is the amount of work required by an external torque to turn the magnet so as to align its magnetic moment, opposite to the field direction ?
cbse
class12
physics
ch-5
sec-a
q19
ncert
medium
asked
Jul 10, 2015
by
meena.p
1
answer
A bar magnet of magnetic moment $1.5\;J/T$ lies aligned with the direction of a uniform magnetic field of $0.22\;T$
cbse
class12
physics
ch-5
sec-a
q18
ncert
medium
asked
Jul 10, 2015
by
meena.p
1
answer
If the solenoid in the above question is free to turn about the vertical direction and a uniform magnetic field of $0.25 \;T$ is applied , what is the magnitude of torque on the solenoid when its axis makes an angle of $30^{\circ}$ with the direction of applied field.
cbse
class12
physics
ch-5
sec-a
q17
ncert
medium
asked
Jul 10, 2015
by
meena.p
1
answer
A closely wound solenoid of 800 turns and area of cross section $2.5 \times 10^{-4} \;m^2$ carries a current of $3.0 \;A$Explain the same in which the solenoid acts like a bar magnet . What is its associate magnetic moment ?
cbse
class12
physics
ch-5
sec-a
q16
ncert
easy
asked
Jul 10, 2015
by
meena.p
1
answer
A short bar magnet of magnetic moment $m= 0.32 \;J/T$. is placed in a uniform magnetic field of $0.15 \;T$. If the bar is free to rotate in the plane of the field, Which orientation would correspond to its unstable equilibrium ? What is the potential energy of the magnet?
cbse
class12
physics
ch-5
sec-a
q15
ncert
medium
asked
Jul 10, 2015
by
meena.p
1
answer
A short bar magnet of magnetic moment $m= 0.32 \;J/T$. is placed in a uniform magnetic field of $0.15 \;T$. If the bar is free to rotate in the plane of the field, Which orientation would correspond to its stable equilibrium ? What is the potential energy of the magnet?
cbse
class12
physics
ch-5
sec-a
q14
ncert
medium
asked
Jul 10, 2015
by
meena.p
1
answer
A short bar magnet with its axis at $30^{\circ}$ with a uniform external magnetic field of $0.25\;T$ experiences a forque a magnitude equal to $4.5 \times 10^{-2}\;J$ What is the magnitude of magnetic moment of the magnet?
cbse
class12
physics
ch-5
sec-a
q13
ncert
medium
asked
Jul 10, 2015
by
meena.p
1
answer
Instellar space has an excellently weak magnetic field of the order of $10^{-12}\;T$ can such a weak field be of any significant consequence. Explain
cbse
class12
physics
ch-5
sec-a
q12
ncert
easy
asked
Jul 10, 2015
by
meena.p
1
answer
The earth's field departs from its dipole shape substantially at large distance (greater than about 30,000 km) What agencies may be responsible for this distortion ?
cbse
class12
physics
ch-5
sec-a
q11
ncert
easy
asked
Jul 10, 2015
by
meena.p
1
answer
The earth may have reversed the direction of its field several times during its history of 4 to 5 billion years. How can geologists know about the earth field in such distant past ?
cbse
class12
physics
ch-5
sec-a
q10
ncert
easy
asked
Jul 9, 2015
by
meena.p
1
answer
The charged currents in the outer conducting regions of the earth core are thought to be responsible for earth's magnetism. What might be the battery (ie the cource of energy ) to sustain these currents ?
cbse
class12
physics
ch-5
sec-a
q9
ncert
easy
asked
Jul 9, 2015
by
meena.p
1
answer
The earth's core is known to contain iron. yet geologists do not regard this as a source of the earth mergnetisum . Why ?
cbse
class12
physics
ch-5
sec-a
q8
ncert
easy
asked
Jul 9, 2015
by
meena.p
1
answer
The earth's magnetic field from point to point in space . Does it also charge with time ? If so on what time scale does it change appreciably ?
cbse
class12
physics
ch-5
sec-a
q7
ncert
easy
asked
Jul 9, 2015
by
meena.p
1
answer
Geologist claim that besides the main magnetic N-S poles, there are several local poles on the earth's surface oriented in different direction . How is such a thing possible at all ?
cbse
class12
physics
ch-5
sec-a
q6
ncert
easy
asked
Jul 9, 2015
by
meena.p
1
answer
In which direction would a compass free to move in the vertical plane point to, if located right on the geomagnetic north or south pole ?
cbse
class12
physics
ch-5
sec-a
q5
ncert
easy
asked
Jul 9, 2015
by
meena.p
1
answer
The earth's field it is claimed roughly approximately the field due to a dipole of magnetic moment $8 \times 10^{22}J/T$ located at its centre. Check the order of magnitude of this number is same way
cbse
class12
physics
ch-5
sec-a
q4
ncert
easy
asked
Jul 9, 2015
by
meena.p
1
answer
If you made a map of magnetic field line at Melbourne in Australian, would the line seem to go into the ground or come out the ground ?
cbse
class12
physics
ch-5
sec-a
q3
ncert
easy
asked
Jul 9, 2015
by
meena.p
1
answer
The angle of dip at a location in southern India is about $18^{circ}$ would you expect a greater or smaller dip in Britain ?
cbse
class12
physics
ch-5
sec-a
q2
ncert
easy
asked
Jul 9, 2015
by
meena.p
1
answer
A vector needs three quantities for its specification . Name the three independent quantities conventionally used to specify the earth's magnetic field ?
cbse
class12
physics
ch-5
sec-a
q1
ncert
easy
asked
Jul 9, 2015
by
meena.p
1
answer
Three point charges $+2q,-q$ and $ +3q$ . What is the electric flux due to this configuration through the surface S?
cbse
class12
physics
ch-1
sec-a
q100
easy
asked
Jul 8, 2015
by
meena.p
1
answer
If a point change be rotated in a circle of radius r around a charge q, what will be the work done ?
cbse
class12
physics
ch-1
sec-a
q99
easy
asked
Jul 8, 2015
by
meena.p
1
answer
The number of electric lines of force radiating from a closed surface vaccum is $1.13 \times 10^{11}$ . The change enclosed by the surface is
cbse
class12
physics
ch-1
sec-a
q98
medium
asked
Jul 8, 2015
by
meena.p
1
answer
Electrostatic potential V at a point of a distance r from a charge q varies as
cbse
class12
physics
ch-1
sec-a
q97
easy
asked
Jul 8, 2015
by
meena.p
1
answer
Wire is bent in a circle of radius $10\;cm$ It is given a change on it uniformly. What is the electric potential at the center ?
cbse
class12
physics
ch-1
sec-a
q96
medium
asked
Jul 8, 2015
by
meena.p
1
answer
Three charges $+q, 2q$ and $-4 q$ are placed on the three vertices of an equilateral triangle of each side $0.1\;m$ calculate electrostatic potential energy of the system , take $q= 10^{-7} \;c$
cbse
class12
physics
ch-1
sec-a
q93
easy
asked
Jul 8, 2015
by
meena.p
1
answer
ABC is an equilateral triangle of each side $5 \;cm$ . Two charges of $\pm \large\frac{50}{3}$$\times 10^{-3} \mu c$ are placed at A and B respectively . Calculate the magnitude and direction of resultant intensity at C.
cbse
class12
physics
ch-1
sec-b
q94
medium
asked
Jul 8, 2015
by
meena.p
1
answer
Potential energy of an electric dipole at an angle $\theta$ in a uniform electric field is zero when $\theta= ?$
cbse
class12
physics
ch-1
sec-a
q93
easy
asked
Jul 8, 2015
by
meena.p
1
answer
Electric field due to an electric dipole is
cbse
class12
physics
ch-1
sec-a
q92
easy
asked
Jul 8, 2015
by
meena.p
1
answer
In the figure two positive charges $q_2$ and $q_3$ fixed along the y-axis , exert a net electric force in the $+x$ direction on a change $q_1$ fixed along the x-axis . If a positive charge Q is added at $(x,0)$, then the force on $q_1$
cbse
class12
physics
ch-1
sec-a
q91
easy
asked
Jul 8, 2015
by
meena.p
1
answer
Determine the current though the battery of internal resistance $0.5 \Omega$ for the circuit as shown in the figure. How much power is distributed in $6 \Omega$ resistance ?
cbse
class12
physics
ch-3
sec-b
q96
difficult
asked
Jul 8, 2015
by
meena.p
1
answer
Two batteries of emf $e_1$ and $e_2(e_2 > e_1)$ and internal resistance $r_1$ and $r_2$ respectively are connected in parallel as shown in the figure
cbse
class12
physics
ch-3
sec-a
q93
medium
asked
Jul 7, 2015
by
meena.p
1
answer
Consider circuit in the given figure. How much energy is absorbed by electron from the initial state of no current (ignore thermal motion ) to the state of drift velocity ?
cbse
class12
physics
ch-3
sec-b
q91
difficult
asked
Jul 7, 2015
by
meena.p
1
answer
The adjacent fig shows a $2.0 \;V$ potentiometer used for the determined of internal resistance of a cell $1.5 \;v$ cell. The balance point of the cell is open circuit is $76.3 \;cm$ . When a resistor of $9.5 \Omega$ is used in the external circuit of the cell, the balance point shifts to $6.48 \;cm$ length of the wire . Determine the internal resistance of the cell
cbse
class12
physics
ch-3
sec-b
q90
medium
asked
Jul 7, 2015
by
meena.p
1
answer
Determine the current drawn from a 12 v supply with internal resistance $0.5 \Omega$ by the infinite network shown in the figure . Each resistor has $\Omega$ resistance
cbse
class12
physics
ch-3
sec-c
q89
difficult
asked
Jul 7, 2015
by
meena.p
1
answer
Determine equivalent resistance of network shows in the figure.
cbse
class12
physics
ch-3
sec-b
q88
medium
asked
Jul 7, 2015
by
meena.p
1
answer
Given the resistance of $1\Omega,2 \Omega$ and $3 \Omega$ how will be combine them to get an equivalent resistance of $\large\frac{11}{5}$$\Omega$
cbse
class12
physics
ch-3
sec-a
q85
medium
asked
Jul 6, 2015
by
meena.p
1
answer
Given the resistance of $1\Omega,2 \Omega$ and $3 \Omega$ how will be combine them to get an equivalent resistance of $\large\frac{11}{3}$$\Omega$
cbse
class12
physics
ch-3
sec-b
q84
medium
asked
Jul 6, 2015
by
meena.p
1
answer
Draw V-I graph for ohmic and non- ohmic materials give one example each
cbse
class12
physics
ch-3
sec-a
q62
difficult
asked
Jul 6, 2015
by
meena.p
1
answer
When the galvanometer shows no deflection , what will be the current flowing through the $5 \Omega$ resistance ?
cbse
class12
physics
ch-3
sec-a
q49
difficult
asked
Jul 6, 2015
by
meena.p
2
answers
Five equal resistor of each $R \Omega$ are connected as shown in the figures. calculate the equivalent resistance between A and B
cbse
class12
physics
ch-3
sec-a
q47
easy
asked
Jul 6, 2015
by
meena.p
1
answer
The colour coded resistor is as shown in the figure . Compute in mega ohm
cbse
class12
physics
ch-3
sec-a
q8
easy
asked
Jul 6, 2015
by
meena.p
1
answer
Determine the equivalent resistors of the network shown :
cbse
class12
physics
ch-3
sec-b
q7
medium
asked
Jul 6, 2015
by
meena.p
1
answer
An electric kettle has two coils. When one of these is switched on, the water in the kettle boils in 6 minutes. When the other coil is switched on, the water boils in 3 minutes. If the two coils are connected in parallel , find the time taken to boil the water in the kettle .
cbse
class12
physics
ch-3
sec-a
q100
medium
asked
Jul 3, 2015
by
meena.p
1
answer
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