1
Question
A magnetic needle is lying in equilibrium in a uniform magnetic field B. To rotate it through 60o, we need to spend energy W. How much torque needs to be applied to keep it in that position?
A magnetic needle is lying in equilibrium in a uniform magnetic field B. To rotate it through 60o, we need to spend energy W. How much torque needs to be applied to keep it in that position?
Open in App
Solution
The correct option is A
