MHT CET 2025 Physics question

Two wires of equal lengths are bent in the form of a square and a circular loop. They are suspended in a uniform magnetic field and same current is passed through them. Torque experienced by

(A)square loop is greater
(B)both the loops is same but not zero
(C)both the loops is zero
(D)circular loop is maximumCorrect

Answer: (D)

Solution

Torque on a current loop is . Both loops have the same current, the same number of turns, the same field and the same perimeter. For a given perimeter , the circle encloses the greatest area: whereas , and

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Question ID VK-102925