Who discovered the link between electricity and magnetism by observing a compass needle deflect near a current-carrying wire in 1820? MCQ with Answer and Explanation

Question

Who discovered the link between electricity and magnetism by observing a compass needle deflect near a current-carrying wire in 1820?

A. André-Marie Ampère

B. James Clerk Maxwell

C. Hans Christian Ørsted

D. Michael Faraday

Answer: Option C

Solution (By JKSSB Mock Tests)

Hans Christian Ørsted discovered electromagnetism when he noticed an electric current deflected a magnetic compass needle.

This question belongs to: Static General Knowledge Inventions and Discoveries

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Question #1

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The first practical solar cell capable of converting significant sunlight into electricity was invented by whom at Bell Labs?

A. Charles Fritts

B. Gerald Pearson, Calvin Fuller, and Daryl Chapin

C. Theodore Maiman

D. Albert Einstein

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Correct Answer: Option B

Explanation:
In 1954, Pearson, Fuller, and Chapin developed the silicon photovoltaic cell, achieving around 6% energy efficiency.

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Question #2

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The invention of the common household incandescent light bulb configuration featuring durable tungsten filaments was patented by whom?

A. Nikola Tesla

B. Joseph Swan

C. William Coolidge and Irving Langmuir

D. Thomas Edison

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Correct Answer: Option C

Explanation:
Coolidge developed ductile tungsten wire processing, and Langmuir filled bulbs with inert gas, extending operation life dramatically.

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Question #3

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Who discovered the primary mathematical law detailing electric current branching paths, known as the junction rule?

A. Michael Faraday

B. André-Marie Ampère

C. Georg Ohm

D. Gustav Kirchhoff

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Correct Answer: Option D

Explanation:
Kirchhoff's Junction Rule states that the total current entering any electrical network node precisely matches the total current exiting it.

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