"Magnetoencphalography is a non-invasive medical test that uses a superconducting quantum interference device (SQUID) and a computer to measure neuromagnetic activity within the brain. MEG detects, records and analyzes the magnetic fields produced by electrical currents in the brain."
They can use the temporary magnetic field it creates to pick p a metal clip.
<u>Explanation:</u>
When a copper wire is wound around an iron cylinder and current is passed through the wire, the wire wound cylinder acts like a magnet. It is known that a current carrying wire develops a magnetic field around it. This is the magnetic effect of electric current.
When the current carrying wire is wound around a cylinder it will become similar to a solenoid which is a device that continuously produces magnetic field on passing current through it.
The magnetic field will cease existing once the current supply is cut off and thus it is temporary.
Transpiration and guttation are the two important process of removal of excess water from the plants. However, the two processes are different from each other. Transpiration is the removal of water from the stomata present on the leaves. On the contrary, guttation is the process of removal of water from the hydathodes.