A straight conductor of length 0.20 m carries a current of 5 A in a uniform magnetic…
PHYSICS · Single correct · AP · Physics 2: Algebra-based · Magnetism and Electromagnetism · Magnetism and Electromagnetism
Problem
A straight conductor of length 0.20 m carries a current of 5 A in a uniform magnetic field of 0.4 T. The conductor initially makes an angle of 30° with the field. It is then rotated so that the angle becomes 60°, all other quantities remaining unchanged. The force on the conductor after rotation is
(a) 31 times its initial value
(b) 3 times its initial value
(c) equal to its initial value
(d) twice its initial value