Physics Circle home Student Login

Home›Chapters›Moving Charges and Magnetism PYQs›Magnetic Field of Straight Wires›Question 48

JEE Main 2022 (29 Jun, Shift 2) · Magnetic Field of Straight Wires

Magnetic Field of Straight Wires question from JEE Main 2022 (29 Jun, Shift 2)

Q48JEE Main 2022 · 29 JUN · SHIFT 2Easy

Magnetic Field of Straight Wires

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 μ\muT. The equal current flowing in the two conductors is:

Show answer and solution

Answer: (b)

  1. A nonzero midpoint field with equal currents needs opposite directions (same direction gives zero).
  2. 300×10−6=2×2×10−7I0.04=10−5I300 \times 10^{-6} = 2 \times \frac{2 \times 10^{-7} I}{0.04} = 10^{-5} I
  3. I=30 AI = 30\text{ A}
  4. So the answer is (b) 30 A in the opposite direction.
Report a mistake

More questions on Magnetic Field of Straight Wires