For the arrangement shown below, if we want to change the direction in which the magnetic needle gets deflected, then which of the following can be done? (Here AB represents a metallic wire and E represents a battery.)

Changing the length of the wire.

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Increasing the current in the wire.

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Changing the polarity of the battery.

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Decreasing the current in the wire.

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Solution

The correct option is C
Changing the polarity of the battery.
For changing the direction in which magnetic needle gets deflected, we have to reverse the direction of current flowing in the wire. This can be achieved by changing the polarity of the battery.

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For the arrangement shown below, if we want to change the direction in which the magnetic needle gets deflected, then which of the following can be done? (Here AB represents a metallic wire and E represents a battery.)

The correct option is C Changing the polarity of the battery.For changing the direction in which magnetic needle gets deflected, we have to reverse the direction of current flowing in the wire. This can be achieved by changing the polarity of the battery.

The correct option is C
Changing the polarity of the battery.
For changing the direction in which magnetic needle gets deflected, we have to reverse the direction of current flowing in the wire. This can be achieved by changing the polarity of the battery.