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Question

Compass placed near a current carrying wire undergoes deflection, because of the of the current flowing through it.

A
heating effect
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B
magnetic effect
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C
chemical effect
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Solution

The correct option is B magnetic effect
Whenever a current flows through a conducting wire, there is a magnetic field associated with it. This is called the magnetic effect of electric current. When a compass is brought near this field, there is an interaction between the magnetic fields in the current carrying conductor and the magnetic needle of the compass, which causes the deflection of the magnetic needle.

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