Advertisements
Advertisements
प्रश्न
Write a short note on superconductors?
उत्तर
- The resistance of certain materials becomes zero below a certain temperature, known as critical or transition temperature.
- The materials that exhibit this property are known as superconductors and the phenomenon is known as superconductivity.
APPEARS IN
संबंधित प्रश्न
If the potential difference across the ends of a conductor is 220 V and the resistance of the conductor is 44 Ω (ohm), then the current flowing through is _________.
- 0.2 A
- 0.5 A
- 2 A
- 5 A
An electrical bulb is marked 200V, 100W. Calculate the electrical resistance of its filament. If five such
bulbs are connected in series to a 200V supply, how much current will flow through them?
The graph between V and I for a conductor is a straight line passing through the origin.
What should remain constant in a statement of this law?
Fill in the following blank with suitable words:
Resistance is measured in .............. The resistance of a wire increases as the length ..............; as the temperature ..............; and as the cross-sectional area .............. .
How should the two resistances of 2 ohms each be connected so as to produce an equivalent resistance of 1 ohm?
A car bulb connected to a 12 volt battery draws 2 A current when glowing. What is the resistance of the filament of the bulb? Will the resistance be more same or less when the bulb is not glowing?
A metal sphere is kept on an insulting stands. A negatively charged rod is brought near it, then the sphere is earthed as shown. On removing the earthing, and taking the negatively charged rod away, what will be the nature of charge on the sphere? Give reason for your answer.
State the relation correlating the electric current flowing in a conductor and the voltage applied across it. Also, draw a graph to show this. relationship.
Ohm’s law states the relationship between power and voltage.
The heat produced by a 100 w heater in 2 minute is equal to
