Current Electri...

Assertion There is no current in the metals in the absence of electric field.
Reason Motion of free electrons is random.

Assertion Electric appliances with metallic body have three connections, whereas an electric bulb has a two pin connection.
Reason Three pin connections reduce heating of connecting wires.

Assertion The drift velocity of electrons in a metallic wire will decrease, if the temperature of the wire is increased.
Reason On increasing temperature, conductivity of metallic wire decreases.

Assertion The electric bulbs glows immediately when switch is on.
Reason The drift velocity of electrons in a metallic wire is very high.

Assertion Bending a wire does not effect electrical resistance.
Reason Resistance of wire is proportional to resistivity of material.

Assertion In meter bridge experiment, a high resistance is always connected in series with a galvanometer.
Reason As resistance increases current through the circuit increases.

Assertion Voltameter measures current more accurately than ammeter.
Reason Relative error will be small if measured from voltameter.

Assertion The e.m.f. of the driver cell in the potentiometer experiment should be greater than the e.m.f. of the cell to be determined.
Reason The fall of potential across the potentiometer wire should not be less than the e.m.f. of the cell to be determined.

Assertion The resistance of super-conductor is zero.
Reason The super-conductors are used for the transmission of electric power.