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Relative Strength of Magnetic Field Inferred from Magnetic Field Lines

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The number of turns per unit length of a long solenoid is 10. If the average radius is 5cm and it carries a current of 10A, then the ratio of flux densities obtained at the centre and at the end on the axis will be

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4 c m

in diameter and

20 c m

250

turns and carries a current of

15 A

. Calculate the flux through the surface of a disc of

10 c m

radius that is positioned perpendicular to and centred on the axis of the solenoid.

Q. A long solenoid has 200 turns per cm and carries a current i.The magnetic field at its centre is

6.28 \times 10^{- 2} W b / m^{2}

. Another long solenoid has 100 turns per cm and it carries a current i/3.The value of magnetic field at its centre is:

1000

5 c m

length in very long solenoid. It carries a current of

5 A

. The magnetic field at its centre on the axis is _______ T

Q. A long solenoid has

200

c m

and carries a current of

2.5 A m p

. The magnetic field at its centre is (

μ_{0} = 4 π \times 10^{- 7}

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