The earth's magnetic induction at a certain point is $7 \times {10^{ - 5}}\,Wb/{m^2}.$ This is to be annulled by the magnetic induction at the centre of a circular conducting loop of radius $5 \,cm$. The required current in the loop is......$A$
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(b) $\frac{{{\mu _0}}}{{4\pi }} \times \frac{{2\pi i}}{r} = H \Rightarrow \frac{{({{10}^{ - 7}}) \times 2 \times 3.142 \times i}}{{0.05}} = 7 \times {10^{ - 5}}$
$\therefore \,i = \frac{{7 \times 0.05 \times {{10}^{ - 5}}}}{{2 \times 3.142 \times {{10}^{ - 7}}}} = \frac{{35}}{{2 \times 3.142}} = 5.6$ $amp$
$\therefore \,i = \frac{{7 \times 0.05 \times {{10}^{ - 5}}}}{{2 \times 3.142 \times {{10}^{ - 7}}}} = \frac{{35}}{{2 \times 3.142}} = 5.6$ $amp$
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