Page 9 - 10-phy-15 Electromagnetism

15. Electromagnetism eLearn.Punjab

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15.3 TURNING EFFECT ON A CURRENT-CARRYING COIL IN A
MAGNETIC FIELD

If instead of a straight conductor, Fig. 15.8: A current-carrying coil in a magnetic field
we place a current-carrying loop
inside the magnetic field, the loop 9
will rotate due to the torque acting
on the coil. This is also the working
principle of electric motors. Consider
a rectangular coil of wire with sides
PQ and RS, lying perpendicular to the
field, placed between the two poles of
a permanent magnet (Fig. 15.8). Now if
the ends of the coil are connected with
the positive and negative terminals
of a battery, a current would start
flowing through the coil. The current
passing through the loop enters from
one end of the loop and leaves from
the other end.

V: 1.1