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Standard X
Physics
NCERT
Electric Motor
Question

An electric motor works on the principle:
  1. of electromagnetic induction
  2. 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.
  3. both A and B
  4. None of the above

A
of electromagnetic induction
B
None of the above
C
both A and B
D
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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Solution
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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
Q1
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.
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Q2

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

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Q3
A rectangular coil of wire of area 400 cm2 contains 500 turns. It is placed in a magnetic field of induction 4×10−3 T and it makes an angle 60o with the field. A current of 0.2 A is passed through it. The torque on the coil is :
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Q4

Moving coil galvanometer operates on Permanent Magnet Moving Coll (PMMC) mechanism.

Moving coil galvanometers are of two types
(a) Suspended coll
(b) Pivoted coil type or tangent galvanometer,

Its working is based on the fact that when a current carrying coil is placed in a magnetic field, it experiences a torque. This torque tends to rotate the coil about its axis of suspension in such a way that the magnetic flux passing through the coil is maximum.



(iv) 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


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Q5

An electric motor is a device to convert electrical energy into mechanical energy. The motor shown below has a rectangular coil (15 cm×10 cm) with 100 turns placed in a uniform magnetic fleld B=2.5 T. When a current is passed through the coil, lt completes 50 revolutions in one second. the power output of the motor is 1.5 kW. The magnetic moment associated with the coil is
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