| 1. | A magnetic field exists around ? | |
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iron
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copper
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aluminium
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moving charges
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Report Question| 2. | What will be the current passing through the ring shaped air cored coil when number of turns is 800 and ampere turns are 3200 ? | |
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2
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4
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6
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8
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| 3. | Gilbert is a unit of ? | |
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electromotive force
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magnetomotive force
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conductance
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permittivity
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| 4. | The magnetism left in the iron after exciting field has been removed is known as ? | |
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permeance
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residual magnetism
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susceptance
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reluctance
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| 5. | The most effective and quickest way of making a magnet from soft iron is by ? | |
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placing it inside a coil carrying current
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induction
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the use of permanent magnet
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rubbing with another magnet
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| 6. | Fleming's left hand rule is used to find ? | |
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direction of magnetic field due to current carrying conductor
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direction of flux in a solenoid
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direction of force on a current carrying conductor in a magnetic field
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polarity of a magnetic pole
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| 7. | A 300 mm long conductor is carrying a current of 10 A and is situated at right angles to a magnetic field having a flux density of 0.8 T ; the force on the conductor will be ? | |
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240 N
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24 N
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2.4 N
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0.24 N
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| 8. | Hysteresis loop in case of magnetically hard materials is more ...... in shape as compared to magnetically soft materials ? | |
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circular
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triangular
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rectangular
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none of the above
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| 9. | Air gap has ...... reluctance as compared to iron or steel path ? | |
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little
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lower
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higher
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zero
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| 10. | The retentivity (a property) of material is useful for the construction of ? | |
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permanent magnets
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transformers
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non-magnetic substances
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electromagnets
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