A device which converts electrical energy into mechanical energy is
|
(a) Dynamo |
(b) generator |
(c) Electric motor |
(d) Induction coil |
A device which converts electrical energy into mechanical energy is
|
(a) Dynamo |
(b) generator |
(c) Electric motor |
(d) Induction coil |
(c) Electric motor
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A semiconductor device is connected in a series circuit with a battery and a resistance. A current is found to pass through the circuit. If the polarity of the battery is reversed, the current drops almost to zero. The device may be
| (a) A P-type semiconductor | (b) An N-type semiconductor |
| (c) A PN-junction | (d) An intrinsic semiconductor |

$\lambda'>\lambda$
$\lambda'=\lambda$
$\lambda'<\lambda$
Curies law can be written as
|
(a) x ∝ (T - |
(b) x ∝ |
(c) x ∝ |
(d) x ∝ T |
A metallic sheet is inserted between the plates of a parallel plate capacitor. The capacitance of the capacitor
|
(a) Increases |
|
(b) Is independent of the position of the sheet |
|
(c) Is maximum when the metal sheet in the middle |
|
(d) a, b |