- ATo provide potential energy to electrons
- BTo provide kinetic energy to protons
- CTo provide potential energy to protons
- DTo provide kinetic energy to electrons
Explanation:
In a Cathode ray tube electrons comes out from cathode. After cathode, anode is placed, which as being +ively charged, accelerates electrons and provide them kinetic energy.
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What is increased in step-down transformer
|
(a) Voltage |
(b) Current |
(c) Power |
(d) Current density |
The potential difference between the cathode and the target in a Collidge tube is 100 kV. The minimum wavelength of the X-rays emitted by the tube is
|
(a) 0.66 Å |
(b) 9.38 Å |
(c) 0.246 Å |
(d) 0.123 Å |
When electron beam passes through an electric field, they gain kinetic energy. If the same beam passes through magnetic field, then
|
(a) Their energy increases |
|
(b) Their momentum increases |
|
(c) Their potential energy increases |
|
(d) Energy and momentum both remains unchanged |
In the circuit shown, the value of each resistance is r, then equivalent resistance of circuit between points A and B will be
|
(a) (4/3) r |
(b) 3r / 2 |
(c) r / 3 |
(d) 8r/7 |
A parallel plate air capacitor has a capacitance of 100 μμF. The plates are at a distance d apart. If a slab of thickness t( t ≤ d) and dielectric constant 5 is introduced between the parallel plates, then the capacitance will be
|
(a) 50 μμF |
(b) 100 μμF |
(c) 200 μμF |
(d) 500 μμF |