Direction: In the following questions, a statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as:
(a) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
(b) Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of
Assertion (A).
(c) Assertion (A) is true but Reason (R) is false.
(d) Assertion (A) is false but Reason (R) is true
Q.1. Assertion(A): On changing the direction of flow of current through a straight conductor, the direction of a magnetic field around the conductor is reversed.
Reason (R) : The direction of magnetic field around a conductor can be given in accordance with left hand thumb rule.
Answer(c)
Q.2. Assertion(A): The magnitude of the magnetic field at a point on the axis of a current carrying solenoid is inversely proportional to the current flowing through the solenoid.
Reason (R) : The magnitude of the magnetic field at a point on the axis of a current carrying solenoid is directly proportional to the number of turns per unit length of a solenoid.
Answer(d)
Q.3. Assertion(A): A compass needle is placed near a current carrying wire. The deflection of the compass needle decreases when the magnitude of an electric current in the wire is increased.
Reason (R) : Strength of a magnetic field at a point near the conductor increases on increasing the current.
Answer(d)
Q.4. Assertion(A) : A compass needle is placed near a current carrying wire. The deflection of the compass needle decreases when the compass needle is displaced away from the wire.
Reason (R) : Strength of a magnetic field decreases as one moves away from a current carrying conductor.
Answer(a)
Q.5. Assertion(A) : The strength of the magnetic field produced at the centre of a current carrying circular coil increases on increasing the current flowing through the coil.
Reason (R) : Magnetic field strength is inversely proportional to the current flowing in the coil.
Answer(c)
Q.6. Assertion(A) : The strength of the magnetic field produced at the centre of a current carrying circular coil increases on increasing the radius of the circular coil.
Reason (R) : Magnetic field strength is inversely proportional to the radius of the circular coil.
Answer(d)
Q.7. Assertion(A) : The strength of the magnetic field produced at the centre of a current carrying circular coil increases on increasing the number of turns of the circular coil.
Reason (R) : Magnetic field strength is directly proportional to the number of turns of the circular coil.
Answer(a)
Q.8. Assertion(A) : On freely suspending a current-carrying solenoid, it comes to rest in N-S direction just like a bar magnet.
Reason (R) : One end of current carrying straight solenoid behaves as a North pole and the other end as a South pole.
Answer(a)
Q.9. Assertion(A) : Alternating Current is used in household supply.
Reason (R) : AC electric power can be transmitted over long distances without much loss of energy.
Answer(a)
Q.10. Assertion(A) : The strength of the magnetic field at the centre of a circular coil of a wire depends on the radius of the coil
Reason (R) : The strength of the magnetic field at the centre of a circular coil of a wire depends on the number of turns of the wire in the coil.
Answer(b)
Q.11. Assertion(A) : A current carrying wire deflects a magnetic needle placed near it.
Reason (R) : A magnetic field exists around a current carrying wire.
Answer(a)
Q.12. Assertion(A) : Strength of an electromagnet can be increased by increasing the number of turns per unit length in solenoid coil.
Reason (R) : Strength of an electromagnet can be increased by increasing the current flowing through the solenoid.
Answer(b)
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