Magnetic Effects of Current / करंट का चुंबकीय प्रभाव
JEE Main & Advanced
Physics
Magnetic Effects of Current / करंट का चुंबकीय प्रभाव
Question Bank
Force and Torque on a Current Carrying Conductor
question_answer
A circular coil of 20 turns and radius 10 cm is placed in uniform magnetic field of 0.10 T normal to the plane of the coil. If the current in coil is 5 A, then the torque acting on the coil will be [J & K CET 2005]
A) 31.4 Nm
B) 3.14 Nm
C) 0.314 Nm
D) Zero
Correct Answer:
D
Solution :
Since \[\theta =0{}^\circ \] so \[\tau =0\] \[(\because \,\tau =NiAB\sin \theta )\]