The set up in the figure is used to study the relationship between current (I) and potential difference (V) for a wire X.
The rheostat Y is used to:
Vary the current in the circuit.
Vary the resistance of the wire.
Vary electromotive force.
Keep the temperature constant.
An impulse of 100 N is applied to an object.
If this same impulse is delivered over a longer time interval:
The force involved will be decreased.
The force involved will be increased.
The momentum transferred will be decreased.
The momentum transferred will be increased.
The value of X for which the galvanometer in the figure shows a null deflection is:
8Ω.
4Ω.
1Ω.
4.5 Ω.
An ammeter of full scale deflection 5.00 mA is being used to read a current of size 5.00 A.
This can be achieved by:
Connecting it in parallel with a resistance of 0.02 Ω.
Connecting it series with a resistance of 980.00 Ω.
Connecting it in parallel with a resistance of 49.95 Ω.
Connecting it in parallel with a resistance of 0.49 Ω.
If the material X is a copper wire, the relationship between V and I when the switch is closed at constant temperature is:
Lenz’s law.
Ohm’s law.
Hooke’s law.
Coulomb’s law.
