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Physics - Magnetic Effects Of Current

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6. A circular coil carrying current produces a magnetic field B0 at its center. This coil is made itself to 10 turns and the same current is set up in it. The magnetic field B at its center would be (NTSE Odisha, Stage-I, 2012-13)

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7. An electric current through a horizontal metal wire flows in East to West direction, direction of magnetic field at point directly above it is from (NTSE Madhya Pradesh, Stage-I, 2012-13)

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8. The maximum attraction in a magnet is (NTSE Rajasthan, Stage-I, 2013-14)

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9. In the question below, a statement of assertion (A) is followed by corresponding statement of reason (R). Of the following alternatives, choose the correct one.
(A) To keep valuable instruments away from earth's magnetic field, they are enclosed in iron boxes.
(R) Iron boxes repel the earth's magnetic field lines. (NTSE Stage-II,2012-13)

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10. Three rings P, Q and R are dropped at the same time over identical hollow magnets as shown below

Which of the following describes the order in which the ring P, Q and R reach the bottom of the magnet? (NTSE Stage-II, 2012-13)

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Magnetic Effects Of Current