JEE Main 2022 · 29 Jun · Shift 2 · Physics Q39

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PhysicsSingle correct+4 / -1Question 39 of 90

Two long current carrying conductors are placed parallel 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.

Answer and worked solution

Official answer: B

Opposite currents add at the midpoint: $2\cdot\dfrac{\mu_0I}{2\pi(0.04)}=10^{-5}I=3\times10^{-4}$ , so $I=30$ A.

(B)

Topics:Biot-Savart law

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JEE Main 2022 · 29 Jun · Shift 2, Physics question 39