What happens to the resistance when the length of the conductor is doubled without affecting the thickness of the conductor?

What happens to the resistance when the length of the conductor is doubled without affecting the thickness of the conductor?

what happens to the resistance when length of conductor is doubled without affecting the thickness of conductor? R = ρl/A. According to this relation, resistance is directly proportional to length of the conductor. Hence, when length is doubled, the resistance will also get doubled.

On what factors current depends?

Heat produced by electric current passing through a conductor depends upon 4 factors and not 3, that is current, resistance of the conductor, time duration and the medium in which the conductor is placed.

In what way heat depends on current?

When current flows through a conductor, heat energy is generated in the conductor. The heating effect of an electric current depends on three factors: The resistance, R of the conductor. A higher resistance produces more heat.

What are the factors on which the strength of magnetic field depends?

The strength of current in the solenoid: Larger the current passed through solenoid, stronger will be the magnetic field produced. 2. The number of turns in the solenoid: Larger the number of turns in the solenoid, greater will be the magnetic field produced.

On what factors the strength of electromagnet depends?

The strength of an electromagnet depends on: The strength of the current passing through the coil, the greater the current, the greater the strength.

What are two ways to increase the strength of an electromagnet?

You can make an electromagnet stronger by doing these things:

1. wrapping the coil around a piece of iron (such as an iron nail)
2. adding more turns to the coil.
3. increasing the current flowing through the coil.

How is electromagnet used in everyday life?

Electromagnets are found in doorbells, hard drives, speakers, MagLev trains, anti-shoplifting systems, MRI machines, microphones, home security systems, VCRs, tape decks, motors, and many other everyday objects.

What is not needed to make an electromagnet?

You can test your core with a permanent magnet. If a permanent magnet is not attracted to your core, it will not make a good electromagnet. An aluminum bar, for example, is not a good choice for your magnet’s core.

Where is the strongest field in an electromagnet?

The strongest external magnetic fields are near the poles. A magnetic north pole will attract the south pole of another magnet, and repel a north pole. The magnetic field lines of a bar magnet can be traced out with the use of a compass.