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The radius of a coil of wire with N turn...

The radius of a coil of wire with N turns is 0.22m, and 3.5Acurrent flows clockwise in the coil as shown.Along straight wire carrying a current 54A toward the left is located 0.05 m from the edge of the coil. The magnetic field at the centre of the coil is zero tesla. The number of turns Nin the coil are:

A

4

B

6

C

7

D

8

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