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Standard X

Physics

Electric Motor

An electric m...

Question

An electric motor works on the principle:

of electromagnetic induction

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when a rectangular coil is placed in a magnetic field and current is passed through it, a force acts on the coil which rotates it continuously.

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both A and B

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None of the above

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Solution

The correct option is B when a rectangular coil is placed in a magnetic field and current is passed through it, a force acts on the coil which rotates it continuously.
An electric motor utilises the magnetic effect of current. It works on the principle that when a rectangular coil is placed in a magnetic field and current is passed through it, a force acts on the coil which rotates it continuously.

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Similar questions

Q. Question 2
The phenomenon of electromagnetic induction is
(a) the process of charging a body.
(b) the process of generating magnetic field due to a current passing through a coil.
(c) producing induced current in a coil due to relative motion between a magnet and the coil.
(d) the process of rotating a coil of an electric motor.

The phenomenon of electromagnetic induction is

(a) the process of charging a body

(b) the process of generating magnetic field due to a current passing through a coil

(d) the process of rotating a coil of an electric motor

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$(i v)$ In a moving coil galvanometer, having a coil of $N$ -turns of area $A$ and carrying current $I$ is placed in a radial field of strength $B$ . The torque acting on the coil is

Q.
An electric motor is a device to convert electrical energy into mechanical energy. The motor shown below has a rectangular coil

(15 c m \times 10 c m)

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B = 2.5 T

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