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प्रश्न
Write a short note on superconductors?
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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.
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संबंधित प्रश्न
When a 12 V battery is connected across an unknown resistor, there is a current of 2.5 mA in the circuit. Find the value of the resistance of the resistor.
Is Ohm’s law universally applicable for all conducting elements? If not, give examples of elements which do not obey Ohm’s law.
The unit of electrical resistance is:
(a) ampere
(b) volt
(c) coulomb
(d) ohm
Calculate the electric field in a copper wire of cross-sectional area 2.0 mm2 carrying a current of 1 A.
The resistivity of copper = 1.7 × 10–8 Ω m
- Name and state the law which relates the potential difference and current in a conductor.
- What is the necessary condition for a conductor to obey the law named above in part (a) ?
State and define Ohm’s law.
What is non-ohmic resistor?
Choose the correct alternative.
Which of the following is an ohmic conductor?
The resistance of a nichrome wire at 0°C is 10Ω. If its temperature coefficient of resistivity of nichrome is 0.004/ °C, find its resistance of the wire at boiling point of water. Comment on the result.
Which of the following I-V graph represents ohmic conductors?
