Question

Two long straight parallel conductors $10cm$ apart, carry equal currents of magnitude $3A$ in the same direction. Then the magnetic induction at a point midway between them is:

• A. $2\times {10}^{-5}T$
• B. $3\times {10}^{-5}T$
• C. zero
• D. $4\times {10}^{-5}T$

Answer 1

Answer: (C)

zero

At the mid-point of two conductors, the magnetic induction

$B_1=B_2=B$

Net magnetic field $B_R=B_1-B_2=0$