(A) it is easier to pull it
(B) it is difficult to pull it
(C) it cannot be pulled
(D) none of these
Tag: Physics Mcq
A 50 mH coil carries a current of 2A, the energy stored in it in Joules is:
(A) 5.05
(B) 0.1
(C) 0.5
(D) 1
An inductor may store energy in:
(A) its coil
(B) its magnetic field
(C) its electric field
(D) both in electric and magnetic field
The turn ratio in a step up transformer is 4:1. On passing a current of 4 A in the primary, the current in the secondary will be:
(A) 0.25 A
(B) 1 A
(C) 2 A
(D) 8 A
The core of a transformer is laminated to reduce:
(A) copper loss
(B) magnetic loss
(C) eddy current loss
(D) hysteresis loss
The core of transformer is laminated so that:
(A) The ratio of the voltage in the secondary to that in the primary may be increased
(B) Energy losses due to eddy currents may be minimized
(C) The weight of the transformer may be reduced
(D) Rusting of the core may be prevented
Energy stored in the choke coil in the form of:
(A) heat
(B) electricity energy
(C) magnetic energy
(D) electro-magnetic energy
If the rotational velocity of a dynamo armature is doubled, then the induced e.m.f will be:
(A) become half
(B) become double
(C) become quadruple
(D) remain unchanged