Look at the figure given below and answer question based on that.

Iron filings are sprinkled on a cardboard perpendicular to which a current carrying copper wire runs. A compass is placed at point 'P'. The other components of the circuit have their usual meanings

If the polarity of the battery in the circuit is changed then__

nothing happens to the compass.

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the deflection of the compass needle gets reversed.

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the deflection of the compass needle increases a little.

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the deflection of the compass needle decreases a little.

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Solution

The correct option is B
the deflection of the compass needle gets reversed.

Reversing the direction of current in the circuit reverses the direction of the magnetic field strength. As the direction of magnetic field strength reverses its direction, the deflection of the compass needle also reverses.

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