Physics
(a) What name is given to a cylindrical coil of diameter less than it's 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).
Electro-Magnetism
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Answer
(a) Solenoid is a cylindrical coil of diameter less than its length.
(b) The device so obtained is an electromagnet.
(c) It is used in an electric relay.
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