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Question
A compass needle is placed near a current carrying wire. State your observations for the following cases and give reasons for the same in each case -
- Magnitude of electric current in wire is increased.
- The compass needle is displaced away from the wire.
Solution
- The deflection in the compass needle increases as Magnetic field of the current carrying conductor is directly proportional to current flowing through it.
- The deflection in the needle decreases as the magnetic field is inversely proportional to the perpendicular distance from the wire.
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