An instrument which detects electric current is known as_____________?
An instrument which detects electric current is known as_____________?
A. voltmeter
B. rheostat
C. wattmeter
D. galvanometer
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Inductor does not allow the sudden change of
Inductor does not allow the sudden change of
A. current
B. voltage
C. power
D. None of the aboveVoltage developed across an inductor is expressed bY
Sudden change of current means di will change at dt → 0 (dt tends to zero), so sudden change of current means infinite voltage. Therefore it is not possible.A field of force can exist only between_____________?
A field of force can exist only between_____________?
A. two molecules
B. two ions
C. two atoms
D. two metal particlesOut of the following which is an insulating material____________?
Out of the following which is an insulating material____________?
A. Copper
B. Gold
C. Silver
D. PaperThe minimum charge on an ion is______________?
The minimum charge on an ion is______________?
A. equal to the atomic number of the atom
B. equal to the charge of an electron
C. equal to the charge of the number of electrons in an atom (#) zeroThe four bulbs of 40 W each are connected in series swift a battery across them, which of the following statement is true_______________?
The four bulbs of 40 W each are connected in series swift a battery across them, which of the following statement is true_______________?
A. The current through each bulb in same
B. The voltage across each bulb is not same
C. The power dissipation in each bulb is not same
D. None of the aboveCopper 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