- ANature of medium
- BSystem of units
- CIntensity of charge
- DBoth (a) and (b)
Explanation:
The value of $\text{K}=\frac{1}{4\pi\in_0}=8.854\times10^{-12}\text{C}^2\text{N}^{-1}\text{m}^{-2}$
Where ε0 is permittivity of free space.
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When the accelerating voltage applied on the electrons increased beyond a critical value
|
(a) Only the intensity of the various wavelengths is increased |
| (b) Only the wavelength of characteristic relation is affected |
| (c) The spectrum of white radiation is unaffected |
|
(d) The intensities of characteristic lines relative to the white spectrum are increased but there is no change in their wavelength |
A coil of resistance 10 W and an inductance 5H is connected to a 100 volt battery. Then energy stored in the coil is
|
(a) 125 erg |
(b) 125 J |
(c) 250 erg |
(d) 250 J |
Three plates A, B, C each of area
have separation 3mm between A and B and 3mm between B and C The energy stored when the plates are fully charged is

|
(a) 1.6 |
(b) 2.1 |
(c) 5 |
(d) 7 |
In Young’s double slit experiment, distance between two sources is 0.1 mm. The distance of screen from the sources is 20 cm. Wavelength of light used is 5460 Å. Then angular position of the first dark fringe is
|
(a) 0.08° |
(b) 0.16° |
(c) 0.20° |
(d) 0.313° |
Assertion : A parallel plate capacitor is connected across battery through a key. A dielectric slab of constant K is introduced between the plates. The energy which is stored becomes K times.
Reason : The surface density of charge on the plate remains constant or unchanged.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |