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AIIMS 201925 May

Exam: AIIMS
Year: 2019
Date: 25 May
Subject: Physics
Chapter: Magnetic Effects of Current

AIIMS 2019 · 25 May · Physics · Magnetic Effects of Current

Two parallel infinitely long current carrying wires are shown in...

Two parallel infinitely long current carrying wires are shown in figure. If resultant magnetic field at point

P

is zero. Then determine current

I

.

Two parallel infinitely long current carrying wires are shown in figure. If resultant magnetic field at point P is

Options

A $50 \mathrm{~A}$
B $15 \mathrm{~A}$
C $30 \mathrm{~A}$
D $25 \mathrm{~A}$

Correct answer

C. $30 \mathrm{~A}$

Step-by-step solution

At point

P, B_1+B_2=0

\begin{aligned} & \frac{\mu_0 I_1}{2 \pi r_1}=\frac{\mu_0 I_2}{2 \pi r_2} \\ & \frac{I}{27}=\frac{10}{9}, I=30 \mathrm{~A}\end{aligned}

$$

Two parallel infinitely long current carrying wires are shown in figure. If resultant magnetic field at point P is

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