Consider the following statements :1. Superconductors offer infinite conductivity to the flow of electrons at low temperatures.2. The principle of superconductivity can be used in MRI scans.Which of the statements given above is/are not correct ?a)1 onlyb)2 onlyc)Both 1 and 2d)Neither 1 nor 2Correct answer is option 'D'. Can you explain this answer?

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Consider the following statements :

1. Superconductors offer infinite conductivity to the flow of electrons at low temperatures.

2. The principle of superconductivity can be used in MRI scans.

Which of the statements given above is/are not correct ?

a)
1 only
b)
2 only
c)
Both 1 and 2
d)
Neither 1 nor 2

Correct answer is option 'D'. Can you explain this answer?

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Consider the following statements :1. Superconductors offer infinite c...

A superconductor is a material that achieves superconductivity, a state of matter with no electrical resistance and does not allow magnetic fields to penetrate. Superconductivity is the property of certain materials to conduct direct current (DC) electricity without energy loss when they are cooled below a critical temperature. Such materials offer infinite conductivity or zero resistance to the flow of electrons when cooled to low temperatures. So, Statement 1 is correct.
Superconductors have been at the origin of the emergence of the new generation of MRI coils for the last ten years. They have helped enhance the quality of the images and the comfort of the patients. The Magnetic field in the MRI is generated by a large superconducting electromagnet in which an electric current flows. The weak resistance of superconductors allows very strong currents to flow with no heating in the material, hence enabling to get very high fields of several Tesla. Once the current flow in the coil and the magnetic field is established, the only thing to do is close the coil and hence “trap” the current. The current can flow and will never dissipate since there is no resistance. The electric supply that initiated the current can then be unplugged: the current and the induced magnetic field will stay the same as long as the temperature is cold enough. The helium tanks in MRIs must hence be filled regularly in order to compensate for the evaporation of liquid helium. So, Statement 2 is correct.

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Consider the following statements :1. Superconductors offer infinite conductivity to the flow of electrons at low temperatures.2. The principle of superconductivity can be used in MRI scans.Which of the statements given above is/are not correct ?a)1 onlyb)2 onlyc)Both 1 and 2d)Neither 1 nor 2Correct answer is option 'D'. Can you explain this answer?

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