Most Important Selected Qs for JEE AdvancedPhysicsMagnetic Effects of Current
A point charge of 0.1 C is placed on the circumference of a non-conducting ring of radius 1 m which is rotating with a constant angular acceleration of 1 rad / sec ^2 . If ring starts it's motion at t = 0 the magnetic field at the centre of the ring at t=10 sec , is
Options
- A10⁻⁶ ~T
- B10⁻⁷ ~T
- C10⁻⁸ ~T
- D10^7 ~T
Correct answer
B. 10⁻⁷ ~T
Step-by-step solution
aligned = & 0+1 10=10 rad / sec ^2 v & =r =1 10=10 ~m / s & B = ₀ 4 q( v r ) r^3 | B |= ₀ q v 4 r^2 & B= 10⁻⁷ 0.1 10 (1)^2 =10⁻⁷ ~T aligned