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Electricity and Magnetism

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Questions and Answers

Which phenomenon did Hans Christian Oersted discover during his lecture demonstration in 1820?

The reversal of the needle's orientation

The alignment of the needle with the wire

The deflection of the compass needle by a current in a wire (correct)

The relationship between electricity and magnetism

What is the orientation of the needle when a current flows through the wire?

Parallel to the wire

Tangential to an imaginary circle (correct)

Perpendicular to the wire

Aligned with the earth's magnetic field

What happens to the orientation of the needle when the direction of the current is reversed?

The needle remains in the same orientation

The needle aligns with the earth's magnetic field

The needle points towards the wire

The orientation of the needle is reversed (correct)

What factors affect the deflection of the compass needle?

The distance between the wire and the needle Signup and view all the answers

What did the iron filings around the wire form?

A magnetic compass Signup and view all the answers

Which equation represents the force experienced by a charge q in an electric field E?

F = qE Signup and view all the answers

Who stressed the concept of a field and incorporated it into the unification of electricity and magnetism?

Faraday Signup and view all the answers

How do multiple charges contribute to the electric field at a particular point?

The fields add vectorially Signup and view all the answers

Can electric fields vary with time?

No, they are constant Signup and view all the answers

What is the physical role of an electric field?

It can convey energy and momentum Signup and view all the answers