A circular loop of area \(\sqrt{2}\) cm2 and carrying a current of 10 μA is placed in a magnetic field \(\vec{B}\) with its plane parallel to \(\vec{B}\) (B = 15 mT). When the loop has rotated through an angle of 45°, the magnitude of the torque exerted on this loop is
A. zero
B. 15 × 10-12 N∙m
C. 15 × 10-8 N∙m
D. 15 × 10-2 N∙m
Answer:B
A circular loop of area \(\sqrt{2}\) cm2 and carrying a current of 10 μA is placed in a magnetic field \(\vec{B}\) with its plane parallel to \(\vec{B}\) (B = 15 mT). When the loop has rotated through an angle of 45°, the magnitude of the torque exerted on this loop is
A. zero B. 15 × 10-12 N∙m C. 15 × 10-8 N∙m D. 15 × 10-2 N∙m