A straight wire of length 0.5 m and carrying a current of 1.2 A is placed in uniform magnetic field of induction 2 T. The magnetic field is perpendicular to the length of the wire. The force on the wire is :
2. 4 N
1.2 N
3.0 N
2.0 N
A neutron of kinetic energy 50 keV is describing a circular orbit of radius 0.5 m in a plane perpendicular to magnetic field B. The kinetic energy of the proton that describes a circular orbit of radius 0.5 m in the same plane with the same B is
25 keV
50 keV
200 keV
100 keV
At what distance from a long straight wire carrying a current of 12 A will the magnetic field be equal to 3 x 10-5 Wb/m2?
8 × 10-2 m
12 × 10-2 m
18 × 10-2 m
24 × 10-2 m
opposes the magnetic field
The magnetic induction at a point P which is at the distance of 4 cm from a long current carrying wire is 10-3 T. The field of induction at a distance 12 cm from the current will be :
3.33 × 10-4 T
1.11 × 10-4 T
3 × 10-3 T
9 × 10-3 T
Current is flowing in a coil of area A and number of turns N, then magnetic moment of the coil, M is equal to :
NiA
Ni/A
N2Ai
The magnetic field at a distance r from a long wire carrying current I is 0.4 T. The magnetic field at a distance 2r is :
0.2 T
0.8 T
0.1 T
1.6 T
The total charge induced in a conducting loop when it is moved in magnetic field depends on :
the rate of change of magnetic flux
initial magnetic flux only
the total change in magnetic flux
final magnetic flux only
A charge moving with velocity v in X-direction is subjected to a field of magnetic induction in negative X – direction . As a result, the charge will :
remain unaffected
start moving in a circular Y – Z plane
retard along X – axis
moving along a helical path around X – axis
A positively charged particle moving due east enters a region of uniform magnetic field directed vertically upwards. The particle will
continue to move due east
move in a circular orbit with its speed unchanged
move in a circular orbit with its speed increased
gets deflected vertically upwards
