Magnetic compass needle will be deflecting if it is kept near________________?

Related Mcqs:

Which of the following circuit element stores energy in the electromagnetic field ?

A. Inductance B. Condenser C. Variable resistor D. Resistance...

The core of a coil has a length of 200 mm. The inductance of coil is 6 mH. If the core length is doubled, all other quantities, remaining the same, the inductance will be_____________?

A. 3 mH B. 12 mH C. 24mH D. 48mH...

Which of the fpllowing inductor will have the least eddy current losses ?

A. Air core B. Laminated iron core C. Iron core D. Powdered iron core...

A.C cannot be used for________________?

A. producing heat B. producing light C. magnetizing and electroplating D. all the above...

A coil of wire is arranged with its plane perpendicular to a uniform magnetic field o flux density B. when the radius of the coil increases from r1 to r2 in time Δt then what is the emf induced in the coil ?

A. ωB/r22-r12/Δt B. ωB(r2-r1)2/Δt C. ωB(r22-r12)/Δt D. ωB(r22+r12)/Δt...