(A) heated
(B) placed in a time varying magnetic field
(C) placed in an electric field
(D) placed in a uniform magnetic field
Tag: Physics Mcq
An emf of 5 mV is induced in a coil when, in a nearby placed another coil, the current changes by 5 A in 0.1 s. The mutual inductance between the two coils will be:
(A) 1 H
(B) 0.1 H
(C) 0.1mH
(D) 0.001 mH
The mutual induction of a pair of coils is 2H. If the current in one of the coil changes from 10a to zero in 0.1 s , the emf induced in the other coil is:
(A) 2 V
(B) 20 V
(C) 0.2 V
(D) 200 V
The current in a coil changes from 0 to 2 A in 0.05s. If the induced emf is 80 V, the self-inductance of the coil is:
(A) 1 H
(B) 0.5 H
(C) 1.5 H
(D) 2 H
A wire of length 1.0 m moves with a speed of 10 m/s perpendicular to a magnetic field. If the emf induced in the wire is 1.0 V, the magnitude of the field is:
(A) 0.01 T
(B) 0.1 T
(C) 0.2 T
(D) 0.02 T
According to Faraday’s law of electromagnetic induction:
(A) the direction of induced current is such that it opposes the cause producing it
(B) the magnitude of induced emf produced in a coil is directly proportional to the rate of change of magnetic flux
(C) the direction of induced emf is such that it opposes the cause producing it
(D) none of these
Lenz’s law is a consequence of the law of conservation of:
(A) charge
(B) current
(C) momentum
(D) energy
According to Faraday’s law of electromagnetic induction:
(A) Electric field is produced by time varying magnetic flux
(B) Magnetic field is produced by time-varying electric flux
(C) Magnetic field is associated with a moving charge
(D) none of these