A flat coil ABCD is freely suspended between the pole pieces of a U-shaped permanent magnet with the plane of coil parallel to the magnetic field.

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A flat coil ABCD is freely suspended between the pole pieces of a U-shaped permanent magnet with the plane of coil parallel to the magnetic field.

Class 10 | Electro Magnetism | ICSE | Physics | Selina

A flat coil ABCD is freely suspended between the pole pieces of a U-shaped permanent magnet with the plane of coil parallel to the magnetic field.

(c) When will the couple acting on the coil be (i) maximum, (ii) minimum?

(d) Name an instrument which makes use of the principle stated above.

Solution:

(c) (i) When the coil’s plane is parallel to the magnetic field, the couple acting on the coil be maximum.

(ii) When the coil’s plane is parallel to the magnetic field, the couple on coil will be minimum.

(d) A d.c. motor is an instrument that employs the principle.

i

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