Two PN-junctions can be connected in series by three different methods as shown in the figure. If the potential difference in the junctions is the same, then the correct connections will be
|
(a) In the circuit (1) and (2) |
(b) In the circuit (2) and (3) |
| (c) In the circuit (1) and (3) | (d) Only in the circuit (1) |
(b) In the circuit (2) and (3)
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A cylindrical conductor has uniform cross-section. Resistivity of its material increase linearly from left end to right end. If a constant current is flowing through it and at a section distance x from left end, magnitude of electric field intensity is E, which of the following graphs is correct
|
(a)
|
(b)
|
(c)
|
(d)
|
Two straight parallel wires, both carrying 10 ampere in the same direction attract each other with a force of 1
. If both currents are doubled, the force of attraction will be
|
(a) 1 |
(b) 2 |
(c) 4 |
(d) 0.25 |
$\sqrt{\text{gl}}$
$\sqrt{2\text{gl}}$
$\sqrt{3\text{gl}}$
$\sqrt{5\text{gl}}$
The speed of an electron having a wavelength of 
is
|
(a) 7.25 × |
(b) 6.26 × |
(c) 5.25 × |
(d) 4.24 × |
An X-ray tube with a copper target emits Cu 
line of wavelength 1.50 Å. What should be the minimum voltage through which electrons are to be accelerated to produce this wavelength of X rays (h = 6.63 
|
(a) 8280 V |
(b) 828 V |
(c) 82800 V |
(d) 8.28 V |
