1. How does increasing the electric current affect the strength of an electromagnet?
2. What three ways are electromagnets different than magnets?
Do you have a text book for this? If so I'm sure the answers are right there. The answers are also on the internet if you do the correct search. Don't be lazy, look it up.
1. Increasing the electric current affects the strength of an electromagnet by increasing its magnetic field. The strength of an electromagnet is directly proportional to the electric current passing through its coil. When the current is increased, the magnetic field produced by the electromagnet also increases. This is because the electric current generates a magnetic field around the wire, and when the wire is coiled to form an electromagnet, the magnetic fields of the individual coils align and reinforce each other, resulting in a stronger overall magnetic field.
To demonstrate this, you can perform the following experiment:
1. Set up a simple electromagnet by wrapping a wire around an iron nail and connecting both ends of the wire to a power source.
2. Test the strength of the electromagnet by applying a small magnetic object, such as a paperclip, to the nail.
3. Increase the electric current by connecting a higher voltage power source or by adjusting the settings of the power source, if possible.
4. Observe how the strength of the electromagnet increases, and compare the ability of the electromagnet to attract the paperclip with the previous test.
2. Electromagnets differ from permanent magnets in three main ways:
1. Method of magnetization: Permanent magnets are made by aligning the magnetic domains of a material through various processes such as heating and cooling or exposure to a strong magnetic field. On the other hand, electromagnets are magnetized only when an electric current passes through their coil. As long as the current flows in the coil, the electromagnet remains magnetized.
2. Controllability: One of the significant advantages of electromagnets is their controllability. The strength of an electromagnet can be easily adjusted by changing the electric current passing through its coil. By increasing or decreasing the current, the magnetic field and the strength of the electromagnet can also be adjusted. In contrast, the magnetic field of a permanent magnet cannot be controlled or changed.
3. Temporal nature: Electromagnets are temporary magnets; they exist only when an electric current flows through their coil. Once the current is cut off, the magnetic field generated by the electromagnet disappears. Permanent magnets, on the other hand, retain their magnetic properties indefinitely as long as they are not demagnetized or exposed to external influences that can weaken their magnetic field.