Question

A Non-Conducting Disc Of Radius 6M Is Rotated About Its Axis Of Symmetry Perpendicular To The Plane Of The Disc With Uniform Angular Speed 10 Rad/Sec. The Disc Carries A Charge Whose Charge Density Is Given As Where A And B Are Positive Constant And R Is Distance From The Centre Of The Disc. The Value Of A/B For Which Magnetic Field At The Centre Of The Disc Will Be Zero, Is

Answer 1

Answer:

Charge per unit area(σ)=

π/R 2q