Electromagnetic Field Theory
The field at any point on the axis of a current carrying coil will be

 zero.
 perpendicular to the axis.
 at angle of 45° with the axis.
 parallel to axis.

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Electromagnetic Field Theory
Inside a hollow conducting sphere

 electric field changes with distance from the center of the sphere.
 electric field changes with magnitude of the charge given to the conductor.
 electric field is a non zero constant.
 electric field is zero.

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