# GEOLOGY

## EARTH SCIENCE

### MAGNETISM

 Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
A junkyard electromagnet is strong enough to pick up cars, but not trucks. How could it be upgraded to lift larger vehicles?
 A The electric current and the number of coils in the solenoid could be increased. B The electric current could be increased and the number of coils in the solenoid decreased. C The electric current and the number of coils in the solenoid could be decreased. D The electric current could be decreased and the number of coils in the solenoid increased.
Explanation:

Detailed explanation-1: -Strong electromagnets are often used in areas of heavy industry to move large pieces of iron or steel. They are commonly employed in junkyards where a crane with a huge electromagnet is used to pick up, move and drop old junk cars.

Detailed explanation-2: -We can increase the strength of an electromagnet by increasing the number of turns of wire on the coil and but is there any other method with the help of which we can increase the strength of an electromagnet?

Detailed explanation-3: -Using Electromagnets. An electromagnet can be used for moving scrap steel from one place to another. In a scrapyard, a crane has a large iron disc that is not a permanent magnet. The crane operator lowers the electromagnet into a pile of scrap steel and then switches on the electricity.

Detailed explanation-4: -By increasing the current flowing in the coil. By increasing the number of turns in the coil. By inducing the length of the air gap between the poles.

There is 1 question to complete.