Understanding Magnetic Fields and Solenoids

What happens to the magnetic field around a wire when the current is increased?

• The magnetic field disappears.

• The magnetic field strengthens.

• The magnetic field remains unchanged.

• The magnetic field weakens.

How can you determine the direction of the magnetic field around a wire?

• By using the left-hand rule.

• By using the right-hand grip rule.

• By using a thermometer.

• By using a voltmeter.

What is the shape of the magnetic field inside a solenoid?

• Weak and non-uniform.

• Irregular and scattered.

• Circular and weak.

• Strong and uniform.

Which of the following actions will NOT increase the strength of a solenoid's magnetic field?

• Increasing the current.

• Decreasing the number of turns in the coil.

• Increasing the number of turns in the coil.

• Inserting an iron core.

What is an electromagnet?

• A battery.

• A permanent magnet.

• A solenoid with an iron core.

• A wire with no current.