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Question
A circular loop of one turn carries a current of 5.00 A. If the magnetic field B at the centre is 0.200 mT, find the radius of the loop.
Solution
Given:
No. of turns, n = 1
Magnitude of current, i = 5.00 A
Now, let the radius of the loop be r.
Thus, the magnetic field at the centre due to the current in the loop is given by
\[ \Rightarrow r = 1 . 57 \times {10}^{- 2} \] m = 1 . 57 cm
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