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MHT CET 2026 (14 May, Shift 2) · Magnetic Field of Straight Wires

Magnetic Field of Straight Wires question from MHT CET 2026 (14 May, Shift 2)

Q8MHT CET 2026 · 14 MAY · SHIFT 2Medium

Magnetic Field of Straight Wires

Two parallel long wires carry currents $i_1$ and $i_2$ with $i_1 > i_2$ . When the currents are in the same direction, the magnetic field at a point midway between the wires is $10\ \mu$ T. If the direction of $i_2$ is reversed then the field becomes $30\ \mu$ T. The ratio $\frac{i_1}{i_2}$

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Answer: (c)

Same direction: $k(i_1 - i_2) = 10$ ; reversed: $k(i_1 + i_2) = 30$ .
$\frac{i_1 + i_2}{i_1 - i_2} = 3 \Rightarrow 2i_1 = 4i_2$
$\frac{i_1}{i_2} = 2$
So the answer is (c) 2.

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