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A straight horizontal wire of mass 10 mg and length 1 m carries a current of 2 ampere .What minimum magnetic field B should be applied in the region so that the magnetic force on the wire may balance its weight. |
$2.45 × 10^{-4} T$ $4.9 x 10^{-4} T$ $4.9 x 10^{-5} T$ $9.8 × 10^{-4} T$ |
$4.9 x 10^{-5} T$ |
$\text{For weight to be balanced by magnetic force mg = ilB}$ $\Rightarrow B = \frac{mg}{iL}= 4.9 \times 10^{-5} T$ |
