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Q.

Which of the following is a way of discriminating a wire carrying current to a wire with no current?


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a

Compass

b

Ruler

c

Both 

d

None of these  

answer is A.

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Detailed Solution

Deflection of the compass needle discriminates a wire carrying current from a wire carrying no current.
When a current flows in the wire, a magnetic field is produced, which causes a deflection in the compass's needle when brought near the wire. Also, when no current flows in the wire, no deflection is seen in the compass needle.
 
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