A charge q is moving in a circle of radius 'a' with constant angular velocity ω.

Engineering

Physics

Magnetization and Magnetic Intensity

Question

magnetic field on the axis of ring at a distance r from the centre will vary with time

magnetic field on the axis of ring at a distance r from the centre will remain constant

direction of magnetic field on the axis of ring at a distance r from the centre will vary with time.

magnetic field at the centre of the ring will be constant.

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$\vec{B} = \frac{μ_{0}}{4 π} \frac{Q \vec{v} \times \vec{r}}{| \vec{r} |^{3}}$

$\vec{v} = ωx \hat{j} + ωy (- \hat{i})$

$\vec{r} = z \hat{k} - x \hat{i} - yj$

$\vec{B}$ is const. if z = 0 otherwise const in magnitude but varying in direction.

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