physics : class12 Galvanometer Deflection : Induced Current : Electromagnetic Induction and Alternating Currents MCQ Questions and Answers
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Galvanometer Deflection
MCQ questions and answers.
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MCQ Questions
1. What happens to the deflection of a galvanometer when a bar magnet is moved toward a coil connected to it?
A.
The galvanometer shows a deflection
B.
The galvanometer shows no deflection
C.
The galvanometer needle breaks
D.
The galvanometer becomes permanently charged
Correct Answer:
The galvanometer shows a deflection
Explanation:
Moving the magnet changes the magnetic flux through the coil, inducing a current that causes the galvanometer to deflect.
2. What happens to the galvanometer needle when a magnet is held stationary inside a coil?
A.
It shows continuous deflection
B.
It shows no deflection
C.
It deflects only to the right
D.
It deflects continuously in both directions
Correct Answer:
It shows no deflection
Explanation:
When the magnet is stationary, the magnetic flux through the coil does not change, so no induced current flows and the galvanometer does not deflect.
3. If the north pole of a magnet is moved toward a coil, the galvanometer deflects in one direction. What happens when the magnet is moved away?
A.
The deflection is in the opposite direction
B.
The deflection remains in the same direction
C.
The galvanometer shows no deflection in all cases
D.
The galvanometer needle rotates continuously
Correct Answer:
The deflection is in the opposite direction
Explanation:
Reversing the motion reverses the change in magnetic flux, so the induced current and galvanometer deflection also reverse.
4. How does the galvanometer deflection change if a magnet is moved faster toward a coil?
A.
The deflection becomes larger
B.
The deflection becomes smaller
C.
The deflection becomes zero
D.
The direction of deflection changes automatically
Correct Answer:
The deflection becomes larger
Explanation:
A faster change of magnetic flux produces a larger induced current, resulting in a larger galvanometer deflection.
5. What is indicated by a deflection of a galvanometer connected to a coil?
A.
An induced current is flowing in the coil
B.
The coil has no magnetic field
C.
The magnet is permanently fixed
D.
The galvanometer contains no wire
Correct Answer:
An induced current is flowing in the coil
Explanation:
A galvanometer deflects when current passes through it, so its deflection indicates the presence of induced current in the connected coil.
6. If the south pole of a magnet is moved toward a coil, compared with moving the north pole toward it, the galvanometer deflection is generally:
A.
In the opposite direction
B.
Always zero
C.
In exactly the same direction
D.
Unrelated to the magnet's pole
Correct Answer:
In the opposite direction
Explanation:
Changing the pole approaching the coil reverses the change in magnetic flux, so the induced current and galvanometer deflection reverse direction.
7. A coil is connected to a galvanometer. What happens when a magnet is quickly inserted into the coil and then kept still?
A.
The galvanometer deflects briefly and then returns to zero
B.
The galvanometer remains permanently deflected
C.
The galvanometer never deflects
D.
The galvanometer deflects only after the magnet stops
Correct Answer:
The galvanometer deflects briefly and then returns to zero
Explanation:
The magnet's insertion changes the magnetic flux and causes a temporary current. Once the magnet is stationary, the current and deflection become zero.
8. What will happen to the galvanometer deflection if the direction of motion of a magnet through a coil is reversed?
A.
Its direction will reverse
B.
Its direction will remain unchanged
C.
Its magnitude will always become zero
D.
The galvanometer will stop functioning
Correct Answer:
Its direction will reverse
Explanation:
Reversing the magnet's motion reverses the change in magnetic flux, causing the induced current and galvanometer deflection to reverse.
9. When a coil is moved into a magnetic field, the galvanometer connected to it deflects because:
A.
The magnetic flux through the coil changes
B.
The coil becomes permanently magnetic
C.
The galvanometer produces its own current
D.
The resistance of the coil becomes infinite
Correct Answer:
The magnetic flux through the coil changes
Explanation:
Motion of the coil into the magnetic field changes the magnetic flux through it, inducing current and producing galvanometer deflection.
10. If a magnet is moved toward a coil very slowly instead of quickly, the galvanometer deflection is generally:
A.
Smaller
B.
Larger
C.
Unchanged in every case
D.
Always in the opposite direction
Correct Answer:
Smaller
Explanation:
Slow motion produces a slower change in magnetic flux, so the induced current is smaller and the galvanometer deflection is smaller.
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Galvanometer Deflection
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