| 1. | Relative permeability of vacuum is ? | |
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1
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1 W/m
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1/4?
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4? x 10-7 H/m
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Report Question| 2. | ln order to minimise loss due to hysteresis, the magnetic material should have ? | |
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high resistivity
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low hysteresis coefficient
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large B-H loop area
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high retentivity
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| 3. | While comparing magnetic and electric circuits, the flux of magnetic circuit is compared with which parameter of electrical circuit ? | |
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E.m.f.
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Current
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Current density
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Conductivity
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| 4. | The initial rate of rise of current through a coil of inductance 1O H when suddenly connected to a D.C. supply of 200 V is ........... A/s ? | |
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60
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20
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0.05
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600
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