The magnetic field at distance y from the centre on the axis of a disk of radius r and uniform surface charge density σ spinning with angular velocity ω is,
μ0σω3(r2−2y2√r2−y2+2y)
μ0σω3(r2−2y2√r2+y2−2y)
μ0σω3(r2+2y2√r2+y2−2y)
μ0σω2(r2−y2√r2+y2)
A
μ0σω3(r2−2y2√r2−y2+2y)
B
μ0σω2(r2−y2√r2+y2)
C
μ0σω3(r2+2y2√r2+y2−2y)
D
μ0σω3(r2−2y2√r2+y2−2y)
Open in App
Solution
Verified by Toppr
The correct option is Dμ0σω3(r2+2y2√r2+y2−2y) Charge on a ring of radius x and width dx dq=2(πxdx)σ Current, dl=dqdt=2πxσdxdt=ωσxdx dB=μ0dlr22(x2+y2)3/2 B=μ0σω2(r2+2y2√r2+y2−2y).
Was this answer helpful?
6
Similar Questions
Q1
The magnetic field at distance y from the centre on the axis of a disk of radius r and uniform surface charge density σ spinning with angular velocity ω is,