A flat coil ABCD is freely suspended between the poles of a U-shaped permanent magnet with the plane of coil parallel to the magnetic field. (a) What happens when a current is passed in the coil ? (b) When will the coil come to rest ? (c) When will the couple acting on the coil be (i) maximum, and (ii) minimum ? (d) Name an instrument which makes use of the principle stated above.

A flat coil ABCD is freely suspended between the poles of a U-shaped p

1.	A flat coil ABCD is freely suspended between the poles of a U-shaped permanent magnet with the plane of coil parallel to the magnetic field. (a) What happens when a current is passed in the coil ? (b) When will the coil come to rest ? (c) When will the couple acting on the coil be (i) maximum, and (ii) minimum ? (d) Name an instrument which makes use of the principle stated above.
Answer» A flat coil ABCD is freely suspended between the poles of a U-shaped permanent magnet with the plane of coil parallel to the magnetic field. (a) What happens when a current is passed in the coil ? (b) When will the coil come to rest ? (c) When will the couple acting on the coil be (i) maximum, and (ii) minimum ? (d) Name an instrument which makes use of the principle stated above.