Which one is correct relation for thermionic emission
|
(a) |
(b) |
(c) |
(d) |
Which one is correct relation for thermionic emission
|
(a) |
(b) |
(c) |
(d) |
(b)
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The resistance of a wire of iron is 10 ohms and temp. coefficient of resistivity is 5 . At 20
it carries 30 milliamperes of current. Keeping constant potential difference between its ends, the temperature of the wire is raised to 120
. The current in milliamperes that flows in the wire is
|
(a) 20 |
(b) 15 |
(c) 10 |
(d) 40 |
The lateral displacement depends on ______:
Energy of 1g uranium is equal to
|
(a) 9.0 |
(b) 9.0 |
(c) 3.0 |
(d) 3.0 |
A small square loop of wire of side l is placed inside a large square loop of wire of side L (L > l). The loop are coplanar and their centre coincide. The mutual inductance of the system is proportional to
|
(a) l / L |
(b) |
(c) L/l |
(d) |
By ammeter, which of the following can be measured
|
(a) Electric potential |
(b) Potential difference |
(c) Current |
(d) Resistance |
In which radioactive disintegration, neutron dissociates into proton and electron
|
(a) |
(b) β - emission |
(c) γ - emission |
(d) Positron emission |
Conditions of diffraction is
|
(a) |
(b) |
(c) |
(d) None of these |