- AClose to the valence band of the host crystal.
- BClose to conduction band of the host crystal.
- CBelow the conduction band of the host crystal.
- DAbove the conduction band of the host crystal.
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Two uniform wires A and B are of the same metal and have equal masses. The radius of wire A is twice that of wire B. The total resistance of A and B when connected in parallel is
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(a) 4 Ω when the resistance of wire A is 4.25 Ω |
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(b) 5 Ω when the resistance of wire A is 4.25 Ω |
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(c) 4 Ω when the resistance of wire B is 4.25 Ω |
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(d) 4 Ω when the resistance of wire B is 4.25 Ω |

The figure illustrate how B, the flux density inside a sample of unmagnetised ferromagnetic material varies with B0, the magnetic flux density in which the sample is kept. For the sample to be suitable for making a permanent magnet
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(a) OQ should be large, OR should be small |
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(b) OQ and OR should both be large |
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(c) OQ should be small and OR should be large |
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(d) OQ and OR should both be small |