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A long solenoid has 800 turns per metre length of solenoid. A current of 1.6 A flows through it. The magnetic induction at the end of the solenoid on its axis is |
$16 × 10^{-4}$ tesla $8 × 10^{-4}$ tesla $32 × 10^{-4}$ tesla $4 × 10^{-4}$ tesla |
$8 × 10^{-4}$ tesla |
$ B = \frac{\mu_0 nI}{2}$ $n = 800$ $I = 1.6 $ $\Rightarrow B = \frac{4\pi\times 10^{-7}\times 800 \times 1.6}{2} = 8 \times 10^{-4}T$ |
