alp 6 9

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1. What discovery in 1820 led to a significant understanding of the relationship between electricity and magnetism?

A) Oersted's observation of a compass needle deflecting near a wire

B) The invention of the light bulb

C) The development of the steam engine

D) Faraday's electromagnetic induction

2. How did Oersted demonstrate the connection between electrical currents and magnetism?

A) By showing a compass needle deflects when a current flows through a nearby wire

B) By using a galvanometer to detect electrical flow

C) By freezing a magnet in water

D) By observing sparks in a vacuum tube

3. What was the significant contribution of James Clerk Maxwell to electromagnetism in the 19th century?

A) He unified the laws of electricity and magnetism and showed that light is an electromagnetic wave.

B) He invented the electric motor.

C) He discovered radioactivity.

D) He developed the first battery.

4. How is the magnetic field direction around a straight current-carrying wire visualized?

A) As concentric circles around the wire

B) As parallel lines that run along the wire

C) As zigzag patterns around the wire

D) As random lines throughout the space

5. What did Hans Christian Oersted's experiment reveal about the nature of moving charges or currents?

A) Moving charges produce a magnetic field in the surrounding space

B) They have no magnetic influence

C) Moving charges produce sound waves

D) They cause physical displacement of objects

6. What phenomenon occurs when the direction of current is reversed in a wire near a compass?

A) The needle's orientation is reversed

B) The needle spins continuously

C) The needle vibrates slightly

D) The needle remains static

7. What discovery did Hertz make that significantly contributed to electromagnetic theory?

A) Radio waves

B) Electric current

C) Electrolysis

D) Atomic structure

8. How did J.C. Bose and G. Marconi contribute to the development of communication technology?

A) By producing radio waves

B) By inventing the printing press

C) By discovering X-rays

D) By developing the microscope

9. What is represented by a dot in diagrams concerning current and magnetic fields?

A) A current or field emerging out of the plane of the paper

B) A gravitational wave

C) An electron orbit

D) A hole in the paper

10. How does the magnetic force on a charged particle depend on velocity and magnetic field direction?

A) The force acts perpendicular to both velocity and the magnetic field

B) The force acts parallel to velocity

C) The force acts parallel to the magnetic field

D) The force acts in the direction of the earth

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