A student performs an experiment to study the magnetic effect of current around a current carrying straight conductor He reports that CBSE physics class 10

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A student performs an experiment to study the magnetic effect of current around a current carrying straight conductor. He reports that -CBSE physics class 10

(i) the direction of deflection of the north pole of a compass needle kept at a given point near the conductor remains unaffected even when the terminals of the battery sending current in the wire are inter changed.
 (ii) for a given battery, the degree of deflection of a N-pole decreases when the compass is kept at a point farther away from the conductor.
Which of the above observations of the student is incorrect and why?


By:milan-ransingh

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Answers

The first (a) observation is incorrect. The second(b) observation is correct. 
Because the the direction of deflection of the N pole or the direction of the magnetic field produced, changes when the direction of the current flowing through the wire is reversed.


prajwalamv

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