A horizontal wire carries 200A current below which another wire of linear density $20 \times 10^{- 3} k g / m$ carrying a current is kept at 2 cm distance. If the wire kept below hangs in air, then the current in the wire is

9.8 A

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9800A

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980 A

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98 A

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Solution

The correct option is D 98 A
$\frac{M}{l} g = \frac{µ_{0} i_{1} i_{2}}{2 π r} 20 \times 10^{- 3} \times 9.8 = \frac{2 \times 10^{- 7} \times 200 \times i_{2}}{2 \times 10^{- 2}} i_{2} = 98 A$

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A horizontal wire carries 200A current below which another wire of linear density 20×10−3kg/m carrying a current is kept at 2 cm distance. If the wire kept below hangs in air, then the current in the wire is

The correct option is D 98 AMlg=µ0i1i22πr20×10−3×9.8=2×10−7×200×i22×10−2i2=98A

A horizontal wire carries 200A current below which another wire of linear density $20 \times 10^{- 3} k g / m$ carrying a current is kept at 2 cm distance. If the wire kept below hangs in air, then the current in the wire is

The correct option is D 98 A
$\frac{M}{l} g = \frac{µ_{0} i_{1} i_{2}}{2 π r} 20 \times 10^{- 3} \times 9.8 = \frac{2 \times 10^{- 7} \times 200 \times i_{2}}{2 \times 10^{- 2}} i_{2} = 98 A$