A constant current flows in a horizontal wire
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9. A constant current flows in a horizontal wire in the plane of the
paper from east to west . The direction
of magnetic field at a point will be North to South
(a) directly above the wire
(b) directly below the wire
(c) at a point located in the plane of the paper, on the north side
of the wire
(d) at a point located in the plane of the paper, on the south
side of the wire
10. The strength of magnetic field inside a long current carrying
straight solenoid is
(a) more at the ends than at the centre
(b) minimum in the middle
(c) same at all points
(d) found to increase from one end to the other