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The value of ^ncn is (a) n (b) 0 (c) 1 (d) n!

We Know that \(\begin{array}{l}^{n}C_{r}= \frac{n!}{(n-r)!r!}\end{array} \) To calculate the value put \(\begin{array}{l}^{n}C_{n}\end{array} \) in the above formula \(\begin{array}{l}^{n}C_{n}= \frac{n!}{(n-n)!n!}\\=\frac{n!}{0!n!}\\ =... View Article

Two identical short bar magnets each having magnetic moment of 10 Am^2, are arranged such that their axial lines are perpendicular to each other and their centres be along the same straight line in a horizontal plane. If the distance between their centres is 0.2 m, the resultant magnetic induction at a point midway between them is (μ0 = 4π x 10^-7 Hm^-1)

From figure \(\begin{array}{l}B_{net}= \sqrt{B_{a}^{2}+B_{e}^{2}}\\=\sqrt{\left ( \frac{\mu _{0}}{4\pi }.\frac{2M}{d^{3}} \right )^{2}+\left ( \frac{\mu _{0}}{4\pi}.\frac{M}{d^{3}} \right )^{2}}\end{array} \) On further calculation, we... View Article