Physics
Complete the following sentence —
The current is induced in a closed circuit only if there is _ .
Related Questions
Out of the following, which statement is incorrect ?
- The lamination of core prevents loss of energy due to eddy currents.
- The core is made of soft iron.
- A transformer can be used with d.c.
- A closed core is used so as to provide a closed path for magnetic field lines.
(a) What kind of the energy change takes place when a magnet is moved towards a coil having a galvanometer between it's ends?
(b) Name the phenomenon.
In which of the following cases e.m.f. is induced?
(i) A current is started in a wire held near a loop of wire.
(ii) The current is switched off in a wire held near a loop of wire.
(iii) A magnet is moved through a loop of wire.
(iv) A loop of wire is held near a magnet.
A conductor is moved in a varying magnetic field. Name the law which determines the direction of current induced in the conductor.