Question:
A steady current is set up in a cubic network composed of wires of equal resistance and length as shown. What is the magnetic field at the centre P due to the cubic network?
A steady current is set up in a cubic network composed of wires of equal resistance and length as shown. What is the magnetic field at the centre P due to the cubic network?
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Highly symmetric current distributions often lead to zero net magnetic field at the centre.
Updated On: Mar 18, 2026
- ₀ 2I4π d
- ₀ 2I4π √(2)d
- 0
- ₀ 6π I4π d
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The Correct Option is C
Solution and Explanation
Step 1: Analyzing symmetry of the cube. Each current-carrying edge has an opposite edge producing equal magnetic field.
Step 2: Superposition principle. Magnetic fields due to opposite sides cancel each other at the centre.
Step 3: Net magnetic field. The resultant magnetic field at point P is zero.
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