A uniform magnetic field acts right angles to the direction of motion of electrons. As a result, the electron moves in a circular path of radius 2 cm. If the speed of electrons is doubled, then the radius of the circular path will be :
2.0 cm
0.5 cm
4.0 cm
1.0 cm
A current carrying coil is subjected to a uniform magnetic field. The coil will orient so that its plane becomes
inclined at 45o to the magnetic field
inclined at any arbitrary angle to the magnetic field
parallel to the magnetic field
perpendicular to magnetic field
A straight wire of diameter 0.5 mm carrying a current of 1 A is replaced by another wire of 1 mm diameter carrying same current. The strength of magnetic field far away is :
twice the earlier value
same as the earlier value
one – half of the earlier value
one quarter of the earlier value
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 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 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
A 10 eV electron is circulating in a plane at right angles to a uniform field of magnetic induction 10-4 Wb/m2 ( =1.0 gauss). The orbital radius of the electron is :
12 cm
16 cm
11 cm
18 cm
A charged particle of charge q and mass m enters perpendicularly in a magnetic field Kinetic energy of the particle is E, then frequency of rotation will be :
qB/m π
qB/2 πm
qBE/2 πm
qB/2 πE
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
opposes the magnetic field