Conductance : mho :: ____________?
Conductance : mho :: ____________?
A. resistance : ohm
B. capacitance : henry
C. inductance : farad
D. lumen : steradian
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The resistance of a conductor of diameter d and length l is R Ω. If the diameter of the conductor is halved and its length is doubled, the resistance will be
The resistance of a conductor of diameter d and length l is R Ω. If the diameter of the conductor is halved and its length is doubled, the resistance will be
A. R Ω
B. 2R Ω
C. 4R Ω
D. 8R ΩAs per law of resistance, the resistance of the conductor is inversely proportional to its cross-sectional area i.e. it is inversely proportional to the square of the diameter of cross-sectional area of the conductor. As per same law of resistance, the resistance of the conductor is directly proportional to the length of the conductor.
The voltage induced in an inductor is represented as,
The voltage induced in an inductor is represented as,
A. product of its inductance and current through it.
B. ratio of its inductance to the current through it.
C. ratio of the current through it to its inductance.
D. product of its inductance and rate of change of current through it.The instantaneous voltage across the inductor is expressed as the product of inductance and a rate of change of current through it as it doesn’t allow any certain change of current through it. Voltage induced in an inductor is written as
Which one of the following does not have negative temperature co-efficient ____________?
Which one of the following does not have negative temperature co-efficient ____________?
A. Aluminium
B. Paper
C. Rubber
D. MicaWith three resistances connected in parallel, if each dissipates 20 W the total power supplied by the voltage source equals_____________?
With three resistances connected in parallel, if each dissipates 20 W the total power supplied by the voltage source equals_____________?
A. 10 W
B. 20 W
C. 40 W
D. 60 WTwo resistances Rl and Ri are connected in series across the voltage source where Rl>Ri. The largest drop will be across______________?
Two resistances Rl and Ri are connected in series across the voltage source where Rl>Ri. The largest drop will be across______________?
A. Rl
B. Ri
C. either Rl or Ri
D. none of themCopper wire of certain length and resistance is drawn out to three times its length without change in volume, the new resistance of wire becomes__________?
Copper wire of certain length and resistance is drawn out to three times its length without change in volume, the new resistance of wire becomes__________?
A. 1/9 times
B. 3 times
C. 9 times
D. unchanged