Advertisements
Advertisements
Question
State whether the following statement are true or false:
A motor works on the principle electric generator?
Solution
State whether the following statements are true or false:
False. A motor works on the principle that a force is experienced by a current conductor when placed in a magnetic field.
APPEARS IN
RELATED QUESTIONS
The phenomenon of electromagnetic induction is
Two circular coils A and B are placed closed to each other. If the current in the coil A is changed, will some current be induced in the coil B? Give reason.
Describe different ways to induce current in a coil of wire.
An induced current is produced when a magnet is moved into a coil. The magnitude of induced current does not depend on:
(a) the speed with which the magnet is moved
(b) the number of turns of the coil
(c) the resistivity of the wire of the coil
(d) the strength of the magnet
A light metal disc on the top of an electromagnet is thrown up as the current is switched on. Why? Give reason.
A conducting square loop having edges of length 2.0 cm is rotated through 180° about a diagonal in 0.20 s. A magnetic field B exists in the region which is perpendicular to the loop in its initial position. If the average induced emf during the rotation is 20 mV, find the magnitude of the magnetic field.
A transformer has 400 turns in the primary winding and 10 turns in the secondary winding. The primary e.m.f. is 250 V and the primary current is 2.0 A. calculate:
(a) The secondary voltage,
(b) The secondary current, assuming 100% efficiency.
The condition for the praenomen of electromagnetic induction is that there must be a relative motion between ____________.
Which type of force is experienced by a moving charge in a magnetic field?