This is a timed quiz. You will be given 1800 seconds to answer all questions. Are you ready?
1800
Two coils of inductances L1 and L2 are placed close together such that magnetic flux in one coil completely links the other. The mutual inductance between the coils is :
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The relative permeability of a material is 0.999. The substance is:
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What is the SI unit of magnetic flux?
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Two parallel wires carrying currents in opposite directions :
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The relative permeabilty of free space is :
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The current through a coil of inductance 5 H is decreasing at the rate of 2 A/sec. The emf induced in the coil is :
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A magnet is moved a) Quickly . b) slowly towards a coil. The emf induced in the coil is :
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The principle of dynamically induced emf is utilized in :
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mmf does not depend on :
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The unit of permeabilty is :
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Magnetic cores should have
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Which of the following is a ferromagnetic material?
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Which of the following is diamagnetic :
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Retentivity is maximum for:
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which of the following is not a method of magnetization?
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which of the following is most suitable for the cores of electromagnet?
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When a magnet is heated, it
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The relative permeability of Iron is of the order of :
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A coil of radius R has 400 turns and a self-inductance of 32 mH .What will be the inducatnace of a similar coil of 300 turns?
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Iron is ferromagnetic :
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A long solenoid with 2000 turns is 0.8 m long . What is the magnetizing force in the centre of this solenoid, if the exciting current is 2 A?
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If the distance between two similar magnetic poles held 1cm apart be doubled, the the force between the poles will be
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The magnitude of statically induced emf depends on the :
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Which of the following is Paramagnetic?
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Working of Dynamo is based on :
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Magnetism Quiz KSEB Sub Engineer
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