Question

Superconductors are substances which
1. conduct electricity at low temperature
2. offer high resistance to the flow of current
3. offer no resistance to the flow of electricity
4. conduct electricity at high temperatures

Answer 1

Correct Answer - Option 3 : offer no resistance to the flow of electricity

The correct answer is to offer no resistance to the flow of electricity.

• Superconductors are substances that display zero electrical resistance when a current is supplied, and are able to propagate such a current in a circuit indefinitely.
  
•  Superconductors are materials that conduct electricity with no resistance.
  • This means that, unlike the more familiar conductors such as copper or steel, a superconductor can carry a current indefinitely without losing any energy.
  • Superconductors do not lose any current in the form of heat and are therefore totally energy-efficient (except for the energy required to cool them, at Earth temperatures).
  • They stop showing any electrical resistance and they expel their magnetic fields, which makes them ideal for conducting electricity.
  • Superconducting magnets are used in MRI (Magnetic Resonance Imaging) which is a way of looking at the soft parts of the body.
  • They are also going to be used in the new 'Large Hadron Collider experiment at the CERN Particle Physics Lab.