Physics
How is magnetic field due to a straight current carrying wire affected if current in wire is (a) decreased, (b) reversed?
Electro-Magnetism
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Answer
(a) On decreasing current in the wire, the deflection of compass needle decreases which implies that the strength of magnetic field around the wire decreases.
(b) On reversing the direction of current the magnetic needle of compass reverses because the direction of magnetic field reverses.
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