Assertion(A): A current carrying conductor experiences a force when placed in a magnetic field.

Reason (R): Direction of force on the conductor can be determined by using Fleming's Left hand rule.

Assertion(A): A convex lens can be used to light up a fire.

Reason (R): A convex lens converges parallel rays of light coming from the sun at one point. The concentrated heat can burn paper, dry leaves etc.

Assertion(A): Magnitude of an alternating current changes continuously with time.

Reason (R): The frequency of AC in our houses is 50 Hz because it changes direction 50 times in 1 second.

Assertion(A): A user will not get a severe shock on touching the metallic appliance if proper earthing is done in domestic circuit.

Reason (R): The earth wire provides a low resistance conducting path in case of leakage of current to the metallic part of the appliance.

Assertion(A): A user will get a severe shock on touching the metallic appliance if proper earthing is done in domestic circuit.

Reason (R): The earth wire provides a low resistance conducting path in case of leakage of current to the metallic part of the appliance.

Assertion(A): Five resistors, each of resistance 5 Ω, will give an effective resistance of 1 Ω when connected in parallel. 

Reason (R): The equivalent resistance in parallel combination is given by the formula \(R=R_{1}+R_{2}+R_{3}+R_{4}+R_{5}\)

Assertion(A): A small magnetic compass is placed near a current carrying wire. The deflection of compass increases on increasing the magnitude of current flowing in the wire.

Reason (R): Magnetic field near a current carrying conductor decreases as one goes away from the wire.

Assertion(A): A gold wire is stretched 100 times its original length. The resistivity of gold will increase by 10000 times.

Reason (R): The resistivity of a metallic wire depends on the nature of material and temperature.

Assertion(A): The commercial unit of electrical energy is kilowatt hour (kWh)

Reason (R): \(1 kWh=10^{6}\;J\)

Assertion(A): Light travels faster in air than in water.

Reason (R): Greater the refractive index of a medium, greater is the velocity of light in that medium.