JEE Advanced 2009 Physics question
A steady current I goes through a wire loop PQR having shape of a right angle triangle with PQ = 3x, PR = 4x and QR = 5x. If the magnitude of the magnetic field at P due to this loop is , find the value of k.
Answer: 7
Solution
Since the right angle is at P; the sides PQ and PR pass through P and give no field there. Only QR contributes. The perpendicular from P to QR has length and its foot divides QR into
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