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A straight wire of mass 300 g and length 1.5 m carries a current of 2 A. It is suspended in mid air by a uniform transverse magnetic field. The magnitude of the magnetic field is

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1.5 T

1 T

0.5 T

1.5 T

answer is C.

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Detailed Solution

$m g = B I l$

$\begin{array}{l} 0.3 \times 10 = B \times 2 \times 1.5 \\ \Rightarrow B = 1 T \end{array}$

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