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Q.

A student performs an experiment to study the magnetic effect of current around a current carrying straight conductor with the help of a magnetic compass. He reports that


(a)   The degree of the deflection of the compass increases when the compass is moved away from the conductor.


(b)   The degree of the deflection of the compass increases when the current through the conductor is increased.


Which of the above observations is correct?


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a

Only (a)

b

Only (b)

c

Both (a) and (b)

d

None of these 

answer is B.

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Detailed Solution

If the current is increased, the deflection also increases. so  it indicates that the magnitude of the magnetic field produced at a given point increases as the current through the wire increases.
 
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A student performs an experiment to study the magnetic effect of current around a current carrying straight conductor with the help of a magnetic compass. He reports that (a)   The degree of the deflection of the compass increases when the compass is moved away from the conductor.(b)   The degree of the deflection of the compass increases when the current through the conductor is increased.Which of the above observations is correct?