Q1:
Assertion : Safety fuses are made up of materials having a low melting point.
Reason : Safety fuses should be resistant to electric current.
Q2:
Assertion : Copper is used to make electric wires.
Reason : Copper has very low electrical resistance.
Q3:
Assertion : AC load line is used for long distance transmission.
Reason : It has very less loss of energy in long distance transmission.
Q4:
Assertion : The magnitude o f 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 : 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.
Q5:
Assertion : The magnetic field produced by current carrying solenoid is independent of its length and cross-section area.
Reason : The magnetic field inside the solenoid is uniform.
Q6:
Assertion: A solenoid tends to expand, when a current passes through it.
Reason : Two straight parallel metallic wires carrying current in the same direction attract each other.
Q7:
Assertion : Force experienced by moving charge will be maximum if direction of velocity of charge is perpendicular to applied magnetic field.
Reason : Force on moving charge is independent of direction of applied magnetic field.
Q8:
Assertion : There is no change in the energy of a charged particle moving in a magnetic field although a magnetic force is acting on it.
Reason : Work done by centripetal force is always zero.
Q9:
Assertion : In a conductor, free electrons keep on moving but no magnetic force acts on a conductor in a magnetic field.
Reason : Force on free electrons due to magnetic field always acts perpendicular to its direction of motion.
Q10:
Assertion : A current carrying conductor experiences a force in a magnetic field.
Reason : The force acting on a current carrying conductor in a magnetic field is due to interaction between the magnetic field produced by the current carrying conductor and the external magnetic field in which the conductor is placed.
Q11:
Assertion : On changing the direction of flow of current through a straight conductor, the direction of a magnetic field around the conductor is reversed.
Reason : The direction of the magnetic field around a conductor can be given in accordance with the left hand thumb rule.
Q12:
Assertion : Magnetic field lines never intersect.
Reason : At a particular point the magnetic field has only one direction.
Q13:
Assertion : 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 : Strength of a magnetic field decreases as one moves away from a current carrying conductor.
Q14:
Assertion : The magnetic field is stronger at a point which is nearer to the conductor and goes on decreasing on moving away from the conductor.
Reason : The magnetic field B produced by a straight current carrying wire is inversely proportional to the distance from the wire.
Q15:
Assertion : an induced current has a direction such that the magnetic flux that induces the current.
Reason : Above statement is in accordance with conservation of energy.