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CBSE Class 12-science Answered

A square coil of side 4 cm consists of 100 turns. The coil is initially in vertical plane such that the plane of the coil is normal to the magnetic field of induction 0.8 Wb/m². The coil is then turned through 180° about horizontal axis. Find the net change in the magnetic flux.
Asked by Topperlearning User | 07 Jul, 2015, 09:31: AM
answered-by-expert Expert Answer

Given:

A= 4 x 4 = 16 cm² = 16 × 10-4 m²

N = 100, B = 0.8 Wb/m²

 begin mathsize 12px style straight theta subscript 1 space equals space 0 degree space comma space straight theta subscript 2 space equals space 180 degree Net space change space in space magnetic space flux space equals space NBA space open parentheses cos space straight theta subscript 2 space minus space cos space straight theta subscript 1 space close parentheses equals space 100 space cross times space 16 space cross times space 10 to the power of negative 4 end exponent space cross times space 0.8 space open parentheses cos space 180 degree space minus space cos space 0 degree space close parentheses equals space 100 space cross times space 16 space cross times space 10 to the power of negative 4 end exponent space cross times space 0.8 space open parentheses negative 1 space minus space 1 space close parentheses equals space minus space 0.256 space Wb end style

        

Answered by | 07 Jul, 2015, 11:31: AM

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