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A telephonic cable at a place has four l...

A telephonic cable at a place has four long straight horizontal wires carrying a current of `1.0amp.` in the same direction east to west. The earth's magnetic field at the place is `0.39G` and the angle of dip is `35^@`. The magnetic declination is almost zero. What are the resultant magnetic fields at points `4.0cm` below and above the cable?

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SL ARORA-MAGNETISM-Based on (i) Earth s Magnetism (ii) magnetic field of a bar magnet
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