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Hans Christian Oersted accidentally discovered the deflection of a compass needle when a current carrying wire is placed near to it. This led to several discoveries about the correlation of magnetism and electricity. This discovery also led to the invention of radio, television and fibre optics.

1. Who discovered the relationship between electricity and magnetism?

a. Isaac Newton

b. Hans Christian Oersted

c. Charles Babbage

d. Henry Ford

2. What is the unit of magnetic field strength?

a. Joules

b. Pascal

c. Oersted

d. Newton

3. A current carrying wire deflects the compass needle. True or false?

a. TRUE

b. FALSE

4. What is electromagnetism?

a. It is a phenomena which acts between charged particles and is the combination of all magnetic and gravitational forces.

b. It is a phenomena which acts between only air particles and is the combination of all magnetic and nuclear forces.

c. It is a phenomena which acts between non-charged particles and is the combination of all magnetic and electrical forces.

d. It is a phenomena which acts between charged particles and is the combination of all magnetic and electrical forces.

5. The electromagnetic force can be :

a. Attractive

b. Repulsive

c. Both 1 and 2

d. None of the above

1 Answer

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1. b. Hans Christian Oersted

2. c. Oersted

3. a. TRUE

4. d. It is a phenomena which acts between charged particles and is the combination of all magnetic and electrical forces.

5. c. Both 1 and 2

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