A charged particle (charge q ) is moving in a circle of radius R with uniform speed v. The associated magnetic moment μ us given by :
qvR/2
qvR2
qvR
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
qB/m π
qB/2 πm
qBE/2 πm
qB/2 πE
A galvanometer of resistance 50 Ω is connected to a battery of 3 V along with a resistance of 2950 Ω in series. A full scale deflection of 30 divisions is obtained in the galvanometer. In order to reduce this deflection to 20 divisions, the resistance in series should be
5050 Ω
5550 Ω
6050 Ω
4450 Ω
If a long hollow copper pipe caries a current, then magnetic field is produced
Inside the pipe only
Outside the pipe only
Both inside and outside the pipe
No magnetic field is produced
Two equal electric currents are flowing perpendicular to each other as shown in the figure. AB and CD are perpendicular to each other and symmetrically placed with respect to the currents, where do we expect the resultant magnetic field to be zero?
On AB
On CD
On both AB and CD
On both OD and BO
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
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
Tesla is the unit of
magnetic flux
magnetic field
magnetic induction
magnetic moment
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
Magnetic field due to 0.1 A current flowing through a circular coil of radius 0.1m and 1000 turns at the centre of the coil is
0.2 T
2 × 10-4 T
6.28 × 10-4 T
9.8 × 10-4 T
