Question

Resistance wire of 4 ohm resistance is doubled on itself. Calculate the new resistance of the wire? A current through a horizontal power line flows in east to west direction. What is the direction of the magnetic field i) at a point directly below it and ii) at a point directly above it? Explain

Answer 1

Explanation:

Maxwell's Right Hand Thumb Rule states that if one holds the wire carrying current in the right hand so that the thumb points along the wire in the direction of the current, then the fingers will encircle the wire in the direction of the lines of magnetic force.

Now curl the fingers around with thumb pointing east to west. Then the direction of magnetic field below the wire is from north to south.

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