Physics
The potential difference between the terminals of an electric heater is 60 V when it draws a current of 4 A from the source. What current will the heater draw if the potential difference is increased to 127.5 V ?

0.41666666666667
8.5 A
24 A

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Physics
Superconductors are those elements

Whose resistance falls almost to zero at very low temperatures
Whose conductivity is intermediate between metals and insulators
Which turn into insulators at very low temperatures
Which conduct electricity only at super-high temperatures

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