CBSE Class 10 Science 2019 · Paper 31/5/1 · Question 4
A compass needle is placed near a current carrying straight conductor. State your observation for the following cases and give reasons for the same in each case :
- (a)Magnitude of electric current is increased.
- (b)The compass needle is displaced away from the conductor.
Answer
(a) The deflection increases because the field gets stronger; (b) it decreases because the field weakens with distance.
(a) The deflection of the compass needle increases, because the magnetic field produced by the conductor becomes stronger when the current through it is increased.
(b) The deflection of the compass needle decreases, because the magnetic field of the conductor becomes weaker as the distance from the conductor increases.
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