Three long straight wires carrying current are arranged mutually parallel as shown in the figure. The force experienced by 15 cm length of wire Q is ____.
(μo=4π×10−7 T.m/A)
Held on 28 Jan 2026 · Verified 6 Jul 2026.
6×10−6 N towards P
6×10−7 N towards P
6×10−7 N towards R
6×10−6 N towards R
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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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