Question

A thin plastic ring of radius R carries a charge q uniformly spread over the entire ring. The ring is rotating with angular velocity w, about its axis. The magnetic induction at the centre of the ring is-

• A.
• B.
• C.
• D. Zero

Answer 1

Answer: (C)

Answer 2

Due to charge q moving on circular path

B_centre = $\frac { \mu _ { 0 } \mathrm { I } } { 2 \mathrm { R } }$ = =