Physics
Grade-10
Easy
Question
The strength of the magnetic field due to a solenoid can be increased by:
- Decreasing the current strength in the solenoid
- Increasing the number of turns in the solenoid
- By winding solenoid around a plastic rod
- All of the above
Hint:
Magnetic Field is given by firmula B=μNI in which N is number of turns.
The correct answer is: Increasing the number of turns in the solenoid
- A cylindrical Coil of wire whose diameter is small compared to its length is known as a Solenoid.
- The Magnetic Field is directed along the axis of the Solenoid.
- Magnetic Field is given by firmula B=μNI in which N is number of turns.
- So the strength of a solenoid can be increased by increasing the number of turns
-
Higher the number of turns, higher the length and thus the amount of current carrying coil material in use is higher and thus higher the magnetic field due to increased amount of current flowing through the solenoid as a result of the increased number of turns.
Higher the number of turns, higher the length and thus the amount of current carrying coil material in use is higher and thus higher the magnetic field due to increased amount of current flowing through the solenoid as a result of the increased number of turns.
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