Question

directions: select all the correct answers. which of the following are true about electricity and magnetism? a magnetic force can be produced by an electric current. an electric current can be produced by a changing magnetic force. a magnetic force can attract a metal object only if the object is touching the magnet. energy cannot be transferred by an electric current.

Explanation:

• According to electromagnetism, an electric - current can generate a magnetic field (Ampere's law), so a magnetic force can be produced by an electric current.
• Faraday's law of electromagnetic induction states that a changing magnetic flux can induce an electric current.
• Magnetic force can act at a distance and does not require the metal object to be in contact with the magnet.
• Electric current can transfer energy, for example, in electrical appliances.

Answer:

A. A magnetic force can be produced by an electric current.
B. An electric current can be produced by a changing magnetic force.