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Two short bar magnets of moments and are placed coaxially apart. The magnetic field is zero at a point between them. The field at , when one of the magnets is reversed pole to pole is
(a)
(b)
(c)
(d)

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Important Questions on Magnetic Effects of Current and Magnetism
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The rectangular coil of area is in a field Find the torque about the -axis when the coil lies in the position shown and carries a current

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A turns coil shown in figure carries a current of in a magnetic field The torque acting on the coil is

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The total intensity of the earth's magnetic field at equator is units. What will be its value at the poles?

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The earth's magnetic field at a certain place has a horizontal component and the total strength The angle of dip is

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The meniscus of a liquid contained in one of the limbs of a narrow U -tube is placed between the poles of an electromagnet with the meniscus in a line with the field. The liquid is seen to rise to the line. This indicate that the liquid is ___ .

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A solenoid having turns per meter has a core of area and relative permeability It carries a current of The which statement among the following is true ?
