- ACapacitance decreases.
- BCapacitance remains same.
- CCapacitance increases.
- DDepends upon the material of the dielectric.
Explanation:
When a dielectric material is inserted between the plates of the parallel plate capacitor, the capacitance of the capacitor increases with a factor of K. That is C = KC0.
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Moment of inertia of a magnetic needle is 40 gm-cm2 has time period 3 seconds in earth's horizontal field = 3.6
weber/m2. Its magnetic moment will be
|
(a) 0.5 |
(b) 5 |
(c) 0.250 |
(d) 5 |
In a PN-junction diode
|
(a) The current in the reverse biased condition is generally very small |
|
(b) The current in the reverse biased condition is small but the forward biased current is independent of the bias voltage |
|
(c) The reverse biased current is strongly dependent on the applied bias voltage |
|
(d) The forward biased current is very small in comparison to reverse biased current |
energy. The emitted particle is
|
(a) Neutron |
(b) Proton |
(c) α - particle |
(d) Neutrino |
A capacitor is fully charged with a battery. Then the battery is removed and coil is connected with the capacitor in parallel, current varies as
|
(a) Increases monotonically |
(b) Decreases monotonically |
|
(c) Zero |
(d) Oscillates indefinitely |
A copper voltameter is connected in series with a heater coil of resistance 0.1 Ω. A steady current flows in the circuit for twenty minutes and mass of 0.99 g of copper is deposited at the cathode. If electrochemical equivalent of copper is 0.00033 gm/C, then heat generated in the coil is
|
(a) 750 J |
(b) 650 J |
(c) 350 J |
(d) 250 J |
For ferromagnetic material, the relative permeability (, versus magnetic intensity (H) has the following shape
|
(a) |
(b) |
(c) |
(d) |
Light of frequency n is incident on a substance of threshold frequency n0(n0 < n). The energy of the emitted photo-electron will be
|
(a) |
(b) h/v |
(c) |
(d) |
$\frac{1}{\text{v}}-\frac{1}{\text{u}}=\frac{1}{\text{uf}}$
$\frac{1}{\text{v}^2}-\frac{1}{\text{u}}=\frac{1}{\text{f}}$
$\frac{1}{\text{v}-\text{t}}-\frac{1}{\text{u}+\text{t}}=\frac{1}{\text{f}}$
$\frac{1}{\text{v}}-\frac{1}{\text{u}}+\frac{\text{t}}{\text{uv}}=\frac{\text{t}}{\text{f}}$