A parallel plate capacitor has capacitance C. If it is equally filled with parallel layers of materials of dielectric constants K1 and K2 its capacity becomes C1. The ratio of C1 to C is
|
(a) |
(b) |
(c) |
(d) |
(d) 
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If the potential difference applied across X-ray tube is V volts, then approximately minimum wavelength of the emitted X-rays will be
|
(a) |
(b) |
(c) |
(d) |
Two coherent sources have intensity in the ratio of 
. Ratio of (intensity) max/(intensity) min is
|
(a) |
(b) |
(c) |
(d) |
A particle of charge q and mass m is moving along the x -axis with a velocity v and enters a region of electric field E and magnetic field B as shown in figure below for which figure the net force on the charge may be zero
|
(a)
|
(b)
|
(c)
|
(d)
|
An ionization chamber with parallel conducting plates as anode and cathode has 5 
electrons and the same number of singly-charged positive ions per 
. The electrons are moving at 0.4 m/s. The current density from anode to cathode is 
. The velocity of positive ions moving towards cathode is
|
(a) 0.4 m/s |
(b) 16 m/s |
(c) Zero |
(d) 0.1 m/s |
Penetrating power of X-rays can be increased by
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(a) Increasing the potential difference between anode and cathode |
|
(b) Decreasing the potential difference between anode and cathode |
| (c) Increasing the cathode filament current |
|
(d) Decreasing the cathode filament current |
