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EVALUATION & ACTIVITIES

Multi-choice

Question

one of the following scientists discovered the magnetic fields around a current carrying conductor. which one?

Hint

a physics professor

Answers

Robert brown

Andrew Oersted

Hans Oersted

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Question

A round any current carrying conductor there exists a magnetic field

Answers

True

False

Sometimes

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True-False Question

Respond by picking 'true' or 'false' in the following questions

Question 1

A stronger force on a current currying conductor is obtained when the fields, and the electric currents are mutually at right angles.

Hint

Flemming's left hand rule

Question 2

An electric bell is a motor not an electromagnet

Question 3

when a pair of magnetic field lines are directed in different directions, a stronger field is created.

Question 4

The strength of an electromagnet is independent of the length of the solenoid used

Question 5

An electric motor converts electrical energy to mechanical energy.

Question 6

Electromagnets can be used to lift heavy iron metals weighing more than five tonnes.

Question 7

In a simple electric motor the carbon brushes are permanently fixed onto the slip rings (commutator)