An arrangement of three parallel straight wires placed perpendicular to plane of paper carrying same current I along the same direction is shown in fig. Magnitude of force per unit length on the middle wire B is given by:
A. \(\frac{21^{2} \mu_{0}}{\pi d}\)
B. \(\frac{1^{2} \mu_{0}}{\sqrt{2 \pi d}}\)
C. \(\frac{\sqrt{21}^{2} \mu_{0}}{\pi \mathrm{d}}\)
D. \(\frac{1^{2} \mu_{0}}{2 \pi d}\)
Answer:B
An arrangement of three parallel straight wires placed perpendicular to plane of paper carrying same current I along the same direction is shown in fig. Magnitude of force per unit length on the middle wire B is given by:
A. \(\frac{21^{2} \mu_{0}}{\pi d}\) B. \(\frac{1^{2} \mu_{0}}{\sqrt{2 \pi d}}\) C. \(\frac{\sqrt{21}^{2} \mu_{0}}{\pi \mathrm{d}}\) D. \(\frac{1^{2} \mu_{0}}{2 \pi d}\)