Physics

What phenomenon describes electric currents producing their own magnetic fields?

• Electromagnetism

• Electrostatics

• Electrodynamics

• Magnetostatics

How are the magnetic field lines represented around a straight wire carrying an electric current?

• Straight lines parallel to the wire

• Concentric circles around the wire

• Helical spirals along the wire

• Random, irregular patterns

What rule is used to determine the direction of the magnetic field produced by a current-carrying wire?

• Left-hand rule

• Fleming's rule

• Right-hand rule

• Lenz's law

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What are the characteristics of the magnetic field inside a solenoid?

• Weak and non-uniform

• Strong and uniform

• Strong and non-uniform

• Weak and uniform

Which of the following actions would NOT increase the strength of an electromagnet?

• Increasing the current flowing through the solenoid

• Increasing the number of turns in the coil

• Decreasing the length of the coil while keeping the number of turns the same

• Decreasing the current flowing through the solenoid