A disc of radius R rotates with a constant angular velocity \omega about its own axis. Surface charge density of this disc varies as a=\alpha r^{2} where is the distance from center of the disc. The magnetic field intensity at the center of the disc is r^{'} is the distance from center of the disc. The magnetic field intensity at the center of the disc is

{\mu_{0} \alpha \omega R^{2}}/{6}

{\mu_{0} \alpha \omega R^{2}}/{8}

{\mu_{0} \alpha \omega R^{2}}/{3}

AP EAPCET 6 Sep 2021 Shift 2 Paper

Question : 111 of 160

Marks: +1, -0

A disc of radius R rotates with a constant angular velocity ω about its own axis. Surface charge density of this disc varies as a=αr2 where ′r′ is the distance from center of the disc. The magnetic field intensity at the center of the disc is

µ0αωR2
‌
µ0αωR2
6
‌
µ0αωR2
8
‌
µ0αωR2
3

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