JEE MAIN - Physics (2022 - 29th June Evening Shift - No. 8)
Two long current carrying conductors are placed to each other at a distance of 8 cm between them. The magnitude of magnetic field produced at mid-point between the two conductors due to current flowing in them is 300 $$\mu$$T. The equal current flowing in the two conductors is :
30A in the same direction.
30A in the opposite direction.
60A in the opposite direction.
300A in the opposite direction.
Explanation
As Bnet $$\ne$$ 0 that is the wires are carrying current in opposite direction.
$${{{\mu _0}I \times 2} \over {2\pi (4 \times {{10}^{ - 2}})}} = 30 \times {10^{ - 6}}$$ T
$$ \Rightarrow I = {{30 \times {{10}^{ - 6}}} \over {{{10}^{ - 6}}}}$$ A = 30 A in opposite direction.
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