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Question
Will the compass needle show deflection when the switch the circuit shown in figure, is closed?
Figure
Figure
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Solution
No, the compass needle will not show deflection because the circuit given in the figure does not contain any source of electric current. A solenoid itself cannot produce any magnetic field. When electric current passes through it, a magnetic field is created around the conductor, which can deflect the needle of a compass when placed near to it.
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