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Figure shows a cube made from twelve uni...

Figure shows a cube made from twelve uniform wires. Find the magnetic field at the centre of the cube, if a battery is connected between the points A and H.

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We have the following current carrying conducting pairs AB and EH, AF and CH, AD and GH, BG and DE, GF and CD, FE and BC, for which each pair produce equal and opposite magnetic fields at the centre. As a result of it, the resultant magnetic field at the centre will be zero.
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