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  4. Current flows through uniform, square frames as shown in the figure. In which case is the magnetic field at the centre of the frame not zero?

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Q. Current flows through uniform, square frames as shown in the figure. In which case is the magnetic field at the centre of the frame not zero?

Moving Charges and Magnetism

Solution:

In arrangements $a, b$ and $d$, the field at the centre due to the currents flowing in the square frames is zero. The fields here due to the currents are in and out of the frames and they are equal in magnitude.