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The magnetic field of given length of wire for single furn coil at its centre is B then its value for two turns coil for the same wire is

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The magnetic field of given length of wire for single furn coil at its centre is  B then its value for two turns coil for the same wire is 

(a) B/4 

(b) B/2 

(c) 4B 

(d) 2B.

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1 Answer

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Best answer

Correct option  (c) 4B 

Explanation:

The magnetic field -B produced at the centre of a circular coil due to current l flowing through

Magnetic field at the centre for two turns (N = 2) is given by

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