Two compass needles are placed near a current carrying wire at points P and Q as shown in the figure. What can be concluded?

Their needles will not deflect.

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Needle at P only will deflect

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Both the needles will deflect in the same direction.

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The needles will deflect in opposite directions

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Solution

The correct option is D The needles will deflect in opposite directions
Magnetic field due to wire is circular with wire passing through the center of circle. In above fig field line will be coming out of page at point P and going into the page at point Q So needle at P will point toward you (i.e. out of page) and at Q it will point into the page. Therefore (d) is the correct option.

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Similar questions

Electricity and magnetism are said to be inter-related to each other. A current carrying conductor has a magnetic field around it. So, when a compass is brought near to it, we can observe a deflection in the compass. Similarly, a battery is the source of the electric current. What will be the deflection, when we bring a compass near a 3 V cell (battery)?

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