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1.
Two circular coils are made of two identical wires of same length. If the number of turns of two coils are 4 and 2, then the ratio of magnetic induction at centres will be zero
2.
A long, straight wire is turned into a loop of radius 
(see figure). If a current of 8 amperes is passed through the lop, then the value of the magnetic field and its direction as the centre 
of the loop shall be close to
(see figure). If a current of 8 amperes is passed through the lop, then the value of the magnetic field and its direction as the centre of the loop shall be close to
3.
Net magnetic field at the centre of the circle O due to a current through a loop as shown in figure (
4.
Which of the following while in motion cannot be deflected by magnetic field?
5.
A charged particle of mass 
and charge 
describes circular motion of radius 
in a uniform magnetic field of strength 
. The frequency of revolution is
and charge describes circular motion of radius in a uniform magnetic field of strength . The frequency of revolution is
6.
A current of 
, flows in a long, straight wire of radius 
. The intensity of magnetic field on the axis of the wire is
, flows in a long, straight wire of radius . The intensity of magnetic field on the axis of the wire is
7.
A metallic block carrying current 
is subjected to a uniform magnetic induction 
as shown in the figure. The moving charges experience a force 
given by ...... which results in the lowering of the potential of the face ..... Assume the speed of the carriers to be 
is subjected to a uniform magnetic induction as shown in the figure. The moving charges experience a force given by ...... which results in the lowering of the potential of the face ..... Assume the speed of the carriers to be
8.
The magnetic field existing in a region is given by 
A square loop of edge 
and carrying current 
is placed with its edges parallel to 
axis. The magnitude of the net magnetic force experienced by the loop is
A square loop of edge and carrying current is placed with its edges parallel to axis. The magnitude of the net magnetic force experienced by the loop is
9.
A straight conductor carrying current 
If the magnetic field at a distance is 0.4 T, then magnetic field at a distance 
will be
If the magnetic field at a distance is 0.4 T, then magnetic field at a distance will be
10.
The proton is energy 1 MeV describes a circular path in plane at right angles to a uniform magnetic field of 
The mass of the proton is 
The cyclotron frequency of the proton is very nearly equal to
The mass of the proton is The cyclotron frequency of the proton is very nearly equal to