If the number of turns of a solenoid circular coil is doubled, but the current in the coil and radius of the coil remain the same, then what will be the magnetic flux density produced by the coil?
Correct answer: C. Magnetic flux density remains unchanged
- A. Magnetic flux density will be halved
- B. Magnetic flux density increases by different amount at different points
- C. Magnetic flux density remains unchanged
- D. Magnetic flux density will be doubled
Explanation
When the number of turns N is doubled but the solenoid length L also doubles, the magnetic flux density B=μ0(NI/L) remains the same. Therefore, there is no change in B.
This question appeared on the UHS MDCAT 2011 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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