The magnetic field of a plane electromagnetic wave is given by B=2×10−8sin(0.5×103x+1.5×1011t)j^T. The amplitude of the electric field would be
Held on 26 Jul 2022 · Verified 6 Jul 2026.
6Vm−1 along x-axis
3Vm−1 along z-axis
6Vm−1 along z-axis
2×10−8Vm−1 along z-axis
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A short bar magnet placed with its axis at $30^{\circ}$ with an external field of 800 Gauss, experiences a torque of $0.016 \mathrm{~N}. \mathrm{m}$. The work done in moving it from most stable to most unstable position is $\alpha \times 10^{-3} \mathrm{~J}$. The value of $\alpha$ is $\_\_\_\_$.
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$1\,\mu$C charge moving with velocity $\vec{v} = \left(\hat{i} - 2\hat{j} + 3\hat{k}\right)$ m/s in the region of magnetic field $\vec{B} = \left(2\hat{i} + 3\hat{j} - 5\hat{k}\right)$ T. The magnitude of force acting on it is $\sqrt{\alpha} \times 10^{-6}$ N. The value of $\alpha$ is _______.
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