Magnetism

What causes magnetism?

• The motion of electric charges

• The alignment of the sun and the moon

• Gravitational forces between planets

• Chemical reactions between different substances

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What do electrons do to generate magnetism?

• They move in a straight line

• They spin around the nucleus of an atom

• They remain stationary

• They glow

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Why are materials like cloth or paper said to be weakly magnetic?

• Non-magnetic substances and lack of aligned magnetic domains
• Aligned magnetic domains
• High iron content
• Presence of strong magnetic fields

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Which substances are strongly magnetic?

• Lead
• Silver
• Gold
• Iron, Nickel, Cobalt

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What must happen for a substance to become magnetized?

• Random alignment of domains
• Domains align in the same direction
• Increase in pressure
• Temperature decrease

What are the two poles of a magnet called?

• Positive pole and Negative pole
• Top pole and Bottom pole
• East pole and West pole
• North pole and South pole

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What happens when opposite poles of magnets are near each other?

• They create a magnetic field.
• They cancel each other out.
• They repel each other.
• They attract each other.

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How can some substances be magnetized by an electric current?

• Electric current creates heat that attracts magnetic materials.
• Electric current generates sound waves that magnetize substances.
• Electric current flowing through a material creates a magnetic field that aligns magnetic domains within the material.
• Electric current causes a chemical reaction that induces magnetism.

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What is the magnetic field?

• The magnetic field is a vector field that describes the magnetic influence of electric charges in motion.
• The magnetic field is a scalar quantity.
• The magnetic field is only present in the absence of electric charges.
• The magnetic field is perpendicular to the direction of electric charges.

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What role do electrons play in magnetism?

• Electrons create magnetic fields when they move.
• Electrons repel magnetic fields
• Electrons have no effect on magnetism
• Electrons attract magnetic fields

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