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Physics-

General

Easy

Question

The magnetic field in the cylindrical region shown in figure increases at a constant rate of 20 mT/sec. Each side of the square loop ABCD has a length of 1 cm and resistance of 4W. Find the current in the wire AB if the switch S is closed

$1.25 \times 1 0^{- 7} A$ , (anti-clockwise)
$1.25 \times 1 0^{- 7} A$ (clockwise)
$2.5 \times 1 0^{- 7} A$ (anti clockwise)
$2.5 \times 1 0^{- 7} A$ (clockwise)

The correct answer is: $1.25 cross times 1 0 to the power of negative 7 end exponent A$ , (anti-clockwise)

$i equals fraction numerator e over denominator R end fraction equals fraction numerator A over denominator R end fraction. fraction numerator d B over denominator d t end fraction equals fraction numerator left parenthesis 1 cross times 1 0 to the power of negative 2 end exponent right parenthesis to the power of 2 end exponent over denominator 16 end fraction cross times 20 cross times 1 0 to the power of negative 3 end exponent equals 1.25 cross times 1 0 to the power of negative 7 end exponent A$
(Anti-clockwise)

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