Teaching RSMSSB Lab Assistant (Science) 2022 Mock Test Physics Moving Charges and Magnetism Magnetic Field
A positive charge q is distributed over a circular ring of radius a. It is placed in a horizontal plane and is rotated about its axis at a uniform angular speed ω. A horizontal magnetic field B exists in the space. The torque acting on the ring due to the magnetic force is
1
\(\frac{1}{2}q\omega a^2B\)
2
\(\frac{1}{2}q\omega aB\)
3
\(\frac{1}{2}q\omega ^2aB\)
4
\(q\omega a^2B\)