| 1. | Which one of the following statement is NOT true about the magnetic lines of force ? | |
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They attract each other while travelling in the same direction.
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They behave like a stretched elastic string.
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They do not cross each other.
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They can pass through all media.
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Report Question| 2. | The relative permeability of paramagnetic material is ? | |
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slightly greater than zero
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equal to zero
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equal to one
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greater than one
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| 3. | The SI unit of magnetic flux density is ? | |
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Henry
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Tesla
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Coulomb
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Weber
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| 4. | What will be the coefficient of self-induction (in H) of the coil, if the current changes from +4 A to -4 A in 0.10-seconds and the induced EMF is 16 V ? | |
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1.2
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2
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0.2
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0.8
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| 5. | Calculate the intensity of magnetization (in A-m^-1) in a material, if the magnetic field strength of the material is 1800 Amp-m^-1 and the magnetic susceptibility is 0.4*10^-5 ? | |
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0.0058
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0.0072
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0.0061
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0.0035
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| 6. | What will be the produced mmf (in Amp-turns) in a magnetic circuit, if it has 100 number of turns and carrying a current of 0.2 A ? | |
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20
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40
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500
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200
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| 7. | Determine the critical current (in A) for a wire of a material that has a diameter of 2 mm at 8 K. If the critical temperature for the material is 12 K and the magnetic field is 6 x.10^4 Am^-1 ? | |
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221.3
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214.4
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232.5
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207.6
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| 8. | Ohm is the S.I unit of ? | |
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Capacitance
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Inductance
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Resistance
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Conductance
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| 9. | Determine the value of time (in sec) when an average EMF of 100 V is induced in a coil of area 200cm² with 100 turns, when it is completely removed from a magnetic field of 30 T acting at right angles to the coil. ? | |
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0.4
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0.2
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0.6
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0.9
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| 10. | What will be the flux density (in T) of a material in free space, if the field strength of the material is 2 x 10^5 A-m^-1 and the magnetic susceptibility of the material is 0.44 x 10^-3 ? | |
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0.25
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0.5
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0.75
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1
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