1.

Statehow the strength of the magnetic field producedat the centre of a coil by a current through the circularcoil can be increased.

Answer»

Solution :The strenghtof THEMAGNETICFIELD (B) produced at the centre of a COIL by a current through a circular coil can be increased by-
(1) Increaseingthe numberof turns N of the coil `(B prop N)`.
(2) INCREASINGTHE currentI through thecoil `(B prop I)`.
(3) Decreasing the radiusr of the coil `(B prop. (1)/(r))` .


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