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.