Question
The compass needle is displaced away from the straight wire.
✓
Answer
- $(1)$ Deflection of the compass needle changes.
- Because the direction of the magnetic field due to a current is dependent on the direction of the current and hence the deflection of the compass needle changes.
- $(2)$ Deflection of the compass needle at a given point increases.
- Because magnetic field strength is directly proportional to the amount (magnitude) of current.
- $(3)$ Deflection of the compass needle for a given current decreases.
- Because magnetic field strength is inversely proportional to the distance from the wire.
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