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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)
B = B0
B = 10B0
B = 50B0
B = 100B0
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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)
East to west
West to East
North to South
South to North
8. The maximum attraction in a magnet is (NTSE Rajasthan, Stage-I, 2013-14)
In the center
On the sides
On the poles
On the surface
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)
Both assertion and reason are true and reason is the correct explanation of assertion
Both assertion and reason are true but reason is not the correct explanation of assertion
Assertion is true, reason is false
Assertion is false, reason is true
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)
They arrive in the order P, Q, R
They arrive in the order P, R, Q
Rings P and R arrive simultaneously, followed by Q
Rings Q and R arrive simultaneously, followed by P
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