1.

A compass needle is placed near a current - carrying straight wire . Stateyour observation for thefollowingcase and givereason for the samein each case : (1) Direction of electriccurrent in the wireis increased . (2) Magnitudeof electriccurrentin the wireis increased . (3) Teh compass needleis displaced away from the straight wire .

Answer»

Solution :(1) Deflectionof thecompass needlechanges.
BECAUSETHE DIRECTIONOF the magnetic fielddue toa currentis dependent on thedirectionof thecurrentand hence the deflection of the compass needle change .
(2) Deflection of the compass needleat a givepoint increase .
(3) Deflection of the compass needlefor a GIVEN currentdecreases.
Because magnetic fieldstrenghtis inverselyproportional to thedistancefrom the WIRE .


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