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Magnetic Field Due to Current in a Solenoid

In an experim...

Question

In an experiment to know the intensity of magnetic field around a current carrying coil, why is the coil kept in the North South Direction.

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Solution

When the coil is kept in south north direction the magnetic field becomes free. That is when kept in south north direction the geomagnetic does not influence the experiment.

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X

Y

16 cm

10 cm

respectively lie in same vertical plane containing the north-south direction. Coil

X

20

turns and carries a current of

16 A

Y

25

turns and carries a current of

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. The sense of current in

X

is anticlockwise and in coil

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it is clockwise, for an observer looking at the coils, facing the west.
The magnitude and direction of the magnetic field at their common centre is:
(Neglect horizontal component of Earth's magnetic field)

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r

from center on the axis of current carrying coil of radius

^{'} a^{'}

to the magnetic field intensity at the centre of the same coil is

(r << a)

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