- AMetallic conductor
- BThyristor
- CWater voltameter
- Dp-n junction diode
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Let and
be the number of holes and conduction electrons respectively in a semiconductor. Then
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(a) |
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(b) |
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(c) |
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(d) |

The intensity of the electric field required to keep a water drop of radius just suspended in air when charged with one electron is approximately (g = 10 newton/kg e = 1.6
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(a) 260 volt/cm |
(b) 260 newton/coulomb |
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(c) 130 volt/cm |
(d) 130 newton/coulomb |
$\frac{\text{v}}{4}$
$\frac{\text{v}}{2}$
$\text{v}$
$2\text{v}$
A solenoid of 1.5 metre length and 4.0 cm diameter posses 10 turn per cm. A current of 5 ampere is flowing through it. The magnetic induction at axis inside the solenoid is
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(a) 2π |
(b) 2π |
(c) 4π |
(d) 2π |
The energy of a charged capacitor resides in
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(a) The electric field only
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(b) The magnetic field only |
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(d) Neither in electric nor magnetic field |
(d) Neither in electric nor magnetic field |
A bright star is indicated to have a brightness magnitude of – 5 compared to a star of brightness zero magnitude. It means that this star compared to the reference star of zero brightness is
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(a) 100 times less bright |
(b) 5 times more bright |
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(c) 5 times less bright |
(d) 100 times more bright |