(A) ε = εo cos (ωt)
(B) ε = εo sin (ωt)
(C) ε = εo tan (ωt)
(D) ε = εo / sin (ωt)
Author:
The work is stored in in the inductor as:
(A) Elastic potential energy
(B) Kinetic energy
(C) Potential energy
(D) Gravitation potential energy
A transformer is used to change:
(A) The voltage of direct current
(B) The voltage of alternating current
(C) The electrical energy
(D) The magnetic field
A dynmo converts:
(A) Electrical energy into mechanical energy
(B) Mechanical energy into electrical energy
(C) Heat Energy into electrical energy
(D) Magnetic energy into electrical energy
The magnitude of the emf induced in the coil of A.C. generator is given by:
(A) ε = NBA sin ωt
(B) ε = NBA sin ωt / ω
(C) ε = NBAω sin ωt
(D) ε = B sin ωt / NAω
A 50 mH coil carries a current of 2 amps. The energy stored in its magnetic field is:
(A) 0.05 J
(B) 0.1 J
(C) 10 J
(D) 100 Joules
One henry can be defined as:
(A) 1 henry = Amp-sec / volt
(B) 1 henry = Volt-sec / Amp
(C) 1 henry = Volt x Amp-sec
(D) 1 henry = Volt / Amp-sec
Mutual inductance has a practical role in the performance of the:
(A) Radio choke
(B) A.C. generator
(C) D.C. generator
(D) Transformer