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Electricity and Magnetism MCQ question and answer with solution | Physics Gk MCQs

Learn Electricity and Magnetism MCQ Questions and answers with easy and logical explanations in Physics Gk . Electricity and Magnetism MCQ question provides all type of technical mcq questions which is important for SSC-CGL, UPPSC, NDA, CDS and all govt examinations Page-3 section-1

Each section contains 100 MCQs on Electricity and Magnetism .
21
When resistors are connected in series, then net resistance . . . . . . . .
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Answer & Solution
Answer: Option A
No explanation is given for this question. Let's Discuss on Board
22
The resistance of the wire is inversely proportional to . . . . . . . .
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Answer & Solution
Answer: Option D
No explanation is given for this question. Let's Discuss on Board
23
Why is the filament of the electric bulb usually of tungsten?
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Answer & Solution
Answer: Option B
No explanation is given for this question. Let's Discuss on Board
24
Dynamo core is laminated because
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Answer & Solution
Answer: Option D
No explanation is given for this question. Let's Discuss on Board
25
A freely suspended magnet always aligns in the . . . . . . . . direction.
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Answer & Solution
Answer: Option D
No explanation is given for this question. Let's Discuss on Board
26
Which of the following statements is incorrect?
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Answer & Solution
Answer: Option D
No explanation is given for this question. Let's Discuss on Board
27
Inactive nitrogen and argon gases are usually used in electric bulbs in order to
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Answer & Solution
Answer: Option B
No explanation is given for this question. Let's Discuss on Board
28
Which of the following laws deduces the expression for the force between two stationary point charges in vacuum or free space?
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Answer & Solution
Answer: Option B
No explanation is given for this question. Let's Discuss on Board
29
A filament of electric bulb draws a current of 0.8A in 5 minutes. Find the amount of electric charge flowing through the circuit.
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Answer & Solution
Answer: Option A
No explanation is given for this question. Let's Discuss on Board
30
Two long wires each carrying a current in the same direction are placed close to each other.
Which one of the following statement is correct?
Discuss
Answer & Solution
Answer: Option A
Solution:
Question Explanation:
Imagine two parallel wires carrying electricity.
The electricity flowing through these wires creates a magnetic field around each wire.
The direction of the magnetic field depends on the direction of the current.
If the currents in both wires flow in the same direction, their magnetic fields interact in a special way.
The magnetic field of one wire will pass through the other wire.
This interaction between the magnetic fields causes a force.
This force is attractive, meaning the wires pull towards each other.
If the currents flowed in opposite directions, the force would be repulsive (they would push each other away).
Therefore, when currents are flowing constantly in the same direction in both wires, they will attract each other.