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General
Easy
Question
Fig shows a coil bent with all edges of length 1 m and carrying a current of 1A. There exists in space a uniform magnetic field of 2 T in the positively y-direction. Find the torque on the loop
The correct answer is:
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Figure shows a square current carrying loop ABCD of side 10 cm and current i=10 A. The magnetic moment 
of the loop is
Figure shows a square current carrying loop ABCD of side 10 cm and current i=10 A. The magnetic moment of the loop is
physics-General
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A galvanometer has an internal resistance of 
and current required for full scale deflection is 1 mA. Find the series resistances required as shown in fig, to use it as a voltmeter with different ranges, as indicated in fig.
A galvanometer has an internal resistance of and current required for full scale deflection is 1 mA. Find the series resistances required as shown in fig, to use it as a voltmeter with different ranges, as indicated in fig.
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Two conductors 1-3-5 and 2-4-6 are connected at equal potentials on resistors 
and 
. if the switch S is closed. Will this lead to change in the reading of an ammeter.
Two conductors 1-3-5 and 2-4-6 are connected at equal potentials on resistors and . if the switch S is closed. Will this lead to change in the reading of an ammeter.
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A rectangular coil PQ has 2n turns, an area 2a and carries a current 2I, (refer figure). The plane of the coil is at 60° to a horizontal uniform magnetic field of flux density B. The torque on the coil due to magnetic force is
A rectangular coil PQ has 2n turns, an area 2a and carries a current 2I, (refer figure). The plane of the coil is at 60° to a horizontal uniform magnetic field of flux density B. The torque on the coil due to magnetic force is
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A small coil C with N=200 turns is mounted on one of a balance beam and introduced between the poles of an electro magnet as shown in fig. The cross-sectional area of the coil is 
, the length of the arm OA of the balance beam is l=30 cm. When there is no current in the coil the balance is in equilibrium. On passing a current I=22 mA through the coil the equilibrium is restored by putting the additional counterweight of mass 
on the balance pan. Find the magnetic induction at the spot where the coil is located.
A small coil C with N=200 turns is mounted on one of a balance beam and introduced between the poles of an electro magnet as shown in fig. The cross-sectional area of the coil is , the length of the arm OA of the balance beam is l=30 cm. When there is no current in the coil the balance is in equilibrium. On passing a current I=22 mA through the coil the equilibrium is restored by putting the additional counterweight of mass on the balance pan. Find the magnetic induction at the spot where the coil is located.
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In the figure shown a coil of single turn is wound on a sphere of radius R and mass m. The plane of the coil is parallel to the plane and lies in the equatorial plane of the sphere. Current in the coil is 
. The value of B if the sphere is in equilibrium is
In the figure shown a coil of single turn is wound on a sphere of radius R and mass m. The plane of the coil is parallel to the plane and lies in the equatorial plane of the sphere. Current in the coil is . The value of B if the sphere is in equilibrium is
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A thin uniform rod of mass and length l is in equilibrium as shown in figure. P is a pivot. When a current I flows along the rod, it rotates from its place about point P. Assume that there is no effect of current on the spring and the spring remains horizontal. Find the torque experienced by the rod about P and spring force, when the rod makes an angle q with the horizontal.
A thin uniform rod of mass and length l is in equilibrium as shown in figure. P is a pivot. When a current I flows along the rod, it rotates from its place about point P. Assume that there is no effect of current on the spring and the spring remains horizontal. Find the torque experienced by the rod about P and spring force, when the rod makes an angle q with the horizontal.
physics-General
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A ring of mass m and radius r carrying current 
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is applied in the region. If the ring can rotate about the axis AA in x-y plane only.
Find the force on the loo
A ring of mass m and radius r carrying current is lying in the x-y plane with centre at the origin. A uniform magnetic field of strength is applied in the region. If the ring can rotate about the axis AA in x-y plane only.
Find the force on the loo
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A ring of mass m and radius r carrying current is lying in the x-y plane with centre at the origin. A uniform magnetic field of strength is applied in the region. If the ring can rotate about the axis AA in x-y plane only.
Find the initial magnetic energy stored in the ring
A ring of mass m and radius r carrying current is lying in the x-y plane with centre at the origin. A uniform magnetic field of strength is applied in the region. If the ring can rotate about the axis AA in x-y plane only.
Find the initial magnetic energy stored in the ring
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A ring of mass m and radius r carrying current is lying in the x-y plane with centre at the origin. A uniform magnetic field of strength is applied in the region. If the ring can rotate about the axis AA in x-y plane only.
Find initial angular acceleration
A ring of mass m and radius r carrying current is lying in the x-y plane with centre at the origin. A uniform magnetic field of strength is applied in the region. If the ring can rotate about the axis AA in x-y plane only.
Find initial angular acceleration
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Three long wires of resistance in the ratio 3:4:5 are connected in parallel to each other as shown in figure If net force on middle wire is zero then 
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Two long thin parallel conductors of the shape shown in fig carry direct currents 
and 
. The seperation between the conductors is a, the width of the right-hand conductor is equal to b. With both conductors lying in one plane, find the magnetic interaction force between them reduced to a unit of their length.
Two long thin parallel conductors of the shape shown in fig carry direct currents and . The seperation between the conductors is a, the width of the right-hand conductor is equal to b. With both conductors lying in one plane, find the magnetic interaction force between them reduced to a unit of their length.
physics-General
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In given figure, X and Y are two long straight parallel conductors each carrying a current of 2 A. The force on each conductor is F newtons. When the current in each is changed to 1 A and reversed in direction, the force on each is now
In given figure, X and Y are two long straight parallel conductors each carrying a current of 2 A. The force on each conductor is F newtons. When the current in each is changed to 1 A and reversed in direction, the force on each is now
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In the figure shown a current is established in the long straight wire AB. Another wire CD carrying current is placed in the plane of the paper. The line joining the ends of this wire is perpendicular to the wire AB. The force on the wire CD is:
In the figure shown a current is established in the long straight wire AB. Another wire CD carrying current is placed in the plane of the paper. The line joining the ends of this wire is perpendicular to the wire AB. The force on the wire CD is:
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A circular loop of radius a, carrying a current i, is placed in a two-dimensional magnetic field. The centre of the loop coincides with the centre of the field (fig). The strength of the magnetic field at the periphery of the loop is B. Find the magnetic force on the wire.
A circular loop of radius a, carrying a current i, is placed in a two-dimensional magnetic field. The centre of the loop coincides with the centre of the field (fig). The strength of the magnetic field at the periphery of the loop is B. Find the magnetic force on the wire.
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