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Q.

A steady current is set up in a cubic network composed of wires of equal resistance and length d as shown in figure. What is the magnetic field at center P due to the cubic network?

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a

μ04π2Id

b

μ04π3I2d

c

0

d

μ04πθπId

answer is C.

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Detailed Solution

Net magnetic field at l will be zero, because the magnetic field at centre P is cancelled by opposite pairs like AD-EF, etc.
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