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 series with a resistance of 980.00 Ω.
Connecting it in parallel with a resistance of 0.02 Ω.
Connecting it in parallel with a resistance of 0.49 Ω.
Connecting it in parallel with a resistance of 49.95 Ω.
The set up in the figure is used to study the relationship between current (I) and potential difference (V) for a wire X.
If the material X is a copper wire, the relationship between V and I when the switch is closed at constant temperature is:
Coulomb’s law.
Hooke’s law.
Ohm’s law.
Lenz’s law.
An impulse of 100 N is applied to an object.
If this same impulse is delivered over a longer time interval:
The momentum transferred will be decreased.
The force involved will be decreased.
The momentum transferred will be increased.
The force involved will be increased.
Which of the following statements describes an electric generator?
A coil of wire is rotated through a strong magnetic field to produce an electric current.
Forces from a permanent magnet allow a coil of wire to rotate.
Electric potential in a rotating coil of a wire creates a temporary magnet.
An electrical current causes a coil of wire to rotate in a magnetic field.
The rheostat Y is used to:
Vary electromotive force.
Vary the current in the circuit.
Vary the resistance of the wire.
Keep the temperature constant.
