A solenoid of $1.5$ $metre$ length and $4.0\, cm$ diameter posses $10$ $turn$ per $cm$. A current of $5$ $ampere$ is flowing through it. The magnetic induction at axis inside the solenoid is
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(a) $B = {\mu _o}ni = 4\pi \times {10^{ - 7}} \times 5 \times 1000 = 2\pi \times {10^{ - 3}}$ $Tesla$
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