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The radii of two circular coils are 5 cm...

The radii of two circular coils are 5 cm and 10 cm and their number of turns are 40 and 100, respectively. The coils are coplanar and concentric and a 4 A current is sent through the first coil. Find the current and its direction through the second coil so that the magnetic field at thier centre becomes zero?

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3.2 A in opposite direction
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