Physics
Superconductors are substances which

conduct electricity at low temperature
offer no resistance to the flow of electricity
conduct electricity at high temperatures
offer high resistance to the flow of current

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Physics
Which one of the following is not a property of electromagnetic waves?

Electromagnetic waves do not show interference and diffraction.
Electromagnetic waves do not require a medium to propagate.
Oscillating electric field and magnetic field are perpendicular to each other.
Electromagnetic waves are transverse waves

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