AP EAMCET2012PhysicsMagnetic Effects of Current
A magnetic needle lying parallel to a magnetic field is turned through 60^ . The work done on it is W . The torque required to maintain the magnetic needle in the position mentioned above is
Options
- A3 W
- B3 2 W
- CW 2
- D2 W
Correct answer
A. 3 W
Step-by-step solution
Work done aligned W & =M B (1- 60^ ) & = M B 2 aligned The torque required to maintain the magnetic needle aligned & =M B & =M B 60^ & =M B 3 2 & = 3 ~W aligned