In the experiment shown:
Correct answer: D. There is a current in G just after S is opened or closed
- A. There is a steady reading in G as long as S is closed
- B. A motional emf is generated when S is closed
- C. The current in the battery goes through G
- D. There is a current in G just after S is opened or closed
Explanation
The explanation is: Option D) There is a current in G just after S is opened or closed is correct. In case of DC only, change in magnetic flux takes place when the switch "S" is opened or closed. That is when the linked flux is changed and emf is inducued by Faraday's law.
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About Electromagnetism
Magnetic flux density and magnetic flux describe the strength of a magnetic field and the field passing through a surface. A charged particle moving through a magnetic field experiences a force perpendicular to its velocity and may follow circular or helical motion, depending on the angle between velocity and field.
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