A square loop of side 2a, carrying a current I, is kept in the XZ-plane with its centre at the origin. A long straight wire carrying the same current I is placed parallel to the z-axis and passes through the point (0, b, 0), where b >> a. The magnitude of the torque exerted on the loop about the z-axis is given by:

Which Indian independence movement leader was primarily known for his philosophy and practice of non-violent civil disobedience?

Who gave the call for 'Do or Die' during the Quit India Movement in 1942?

Which of the following revolutionary pairs were imprisoned together in Cellular Jail and faced harsh conditions, contributing significantly to the Indian independence movement?