Question

(a) What name is given to a cylindrical coil of diameter less than its length ?
(b) If a piece of soft iron is placed inside the coil mentioned in part (a) and current is passed in the coil from a battery, what name is then given to the device so obtained ?
(c) Give one use of the device mentioned in part (b).

Answer 1

a. Solenoid

b. Electromagnet

c. In electric bells