In a PN-junction
|
(a) P and N both are at same potential |
|
(b) High potential at N side and low potential at P side |
|
(c) High potential at P side and low potential at N side |
|
(d) Low potential at N side and zero potential at P side |
(b) High potential at N side and low potential at P side
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Two wires A and B of same material and mass have their lengths in the ratio 1 : 2. On connecting them to the same source, the rate of heat dissipation in B is found to be 5W. The rate of heat dissipation in A is
|
(a) 10W |
(b) 5W |
(c) 20W |
(d) None of these |
A part of a long wire carrying a current i is bent into a circle of radius r as shown in figure. The net magnetic field at the centre O of the circular loop is
|
(a) |
(b) |
(c) |
(d) |
The X – 1/T graph for an alloy of paramagnetic nature is shown in Fig. The curie constant is, then
|
(a) 57 K |
(b) 2.8 |
(c) 570 K |
(d) 17.5 |
Light rays from a source are incident on a glass prism of index of refraction μ and angle of prism α. At near normal incidence, the angle of deviation of the emerging rays is
|
(a) (μ – 2)α |
(b) (μ – 1) α |
(c) (μ + 1) α |
(d) (μ + 2) α |
