Physics
The diagram below shows a copper conductor placed along the east-west direction. Magnetic compass P is present above the conductor, and Q is below the conductor. If current is passed through the wire from A to B, then which of the two compasses will show prominent deflection and why?
Answer
Compass P will show prominent deflection.
The magnetic field induced by the current in compass P, when added to Earth's magnetic field, will result in a stronger magnetic field above the wire.
The magnetic field induced by the current in compass Q is opposite to Earth's magnetic field, will result in a weaker magnetic field below the wire, depending on the given current's direction.
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