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The magnitude of the magnetic field insi...

The magnitude of the magnetic field inside a long solenoid is increased by

A

A)decreasing its radius

B

B)decreasing the current through it

C

C)increasing its area of cross-section

D

D)introducing a medium of higher permeability

Text Solution

Verified by Experts

The correct Answer is:
D
By field along the axis of a solenoid
`B = mu _(0) ni`
where B= magnetic field
`mu_(0)=` permeability of free space
`mu=` the number of turns per unit length
I = current
So, according to the formula,
The magnitude of the magnetic field inside a long solenoid is increased by introducing a medium of higer permeability
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Knowledge Check

  • Magnetic field inside a solenoid is

    A
    Inversely proportional to its length.
    B
    Directly proportional to its length.
    C
    Directly proportional to current
    D
    Inversely proportional to the number of turns.

  • Find out the magnitude of the magnetic field at a point P due to following current distribution

    A
    `(mu_0ia)/(pir^2)`
    B
    `(mu_0ia^2)/(pir)`
    C
    `(mu_0ia)/(2pir^2)`
    D
    `(2mu_0ia)/(pir^2)`

  • The self inductance of a long solenoid cannot be increased by

    A
    increasing its area of cross-section
    B
    increasing its length
    C
    changing the medium with greater permeability
    D
    increasing the current through it

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