The magnetic field is produced in a solenoid depends on:
Correct answer: D. The number of turns and current in it
- A. Its length
- B. Its length and current in it
- C. Its length and number of turns in it
- D. The number of turns and current in it
Explanation
The correct answer is The number of turns and current in it. The magnetic field strength inside a solenoid is determined by the product of the current flowing through it and the number of turns per unit length. While the length of the solenoid influences the uniformity of the magnetic field, it does not significantly impact its strength. Thus, Option D is correct. Options A, B, and C incorrectly emphasize the length of the solenoid as a primary factor, which is not the case.
This question appeared on the NUMS 2018 paper, which you can sit online with every answer explained.
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About Magnetic Flux Density
Magnetic flux density measures the magnetic force acting on a current carrying conductor or moving charge in a magnetic field. Work includes the relations B equals F divided by IL and F equals qvB, the tesla as its SI unit, field direction and the distinction between flux density and magnetic flux.
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