Which Maxwell equation says there is no magnetic charge?

• Gauss for magnetism
• Faraday's law
• The Ampere-Maxwell law

A loop circles the gap of a charging capacitor. What plays the role of current through the loop?

• Nothing: the loop rule breaks and cannot be repaired
• The changing electric flux between the plates
• The static charge sitting on the plates

Magnetic poles always come in north-south pairs, and no lone pole has been found.

Changing magnetic flux makes a curling electric field around it. Which equation says this?

• Gauss for E
• Faraday's law
• Gauss for magnetism

Which term does Maxwell add to the right side of Ampere's loop rule?

• mu0 times the conduction current through the gap
• eps0 times the static electric field between plates
• mu0 eps0 times the rate of change of electric flux

How did Maxwell's equations predict light?

• They combine into a wave with speed 1 over sqrt(mu0 eps0)
• They forbid changing fields, so no wave can leave a source
• They show light needs a material medium such as air

An antenna current oscillates, and a distant receiver with no wire link picks up the signal. How does the signal get there?

• Electrons leave the antenna and fly through the air to the receiver
• Accelerating charges launch E and B waves that carry the signal
• The battery pushes a steady current across the empty space

A student says the equations are fully symmetric, with lone north poles sourcing fields as usual. What is the error?

• Symmetry is perfect: lone north poles source the field
• The equations forbid electric charge as well
• No magnetic charge is in the set; poles come in pairs