Explanation:
When it comes to he breakdown in a reverse biased PN junction diode, it will probably happen only because of the accumulation of the higher charge at the biased region and large velocity of the minority charge if the doping concentration is small. This is the main cause the breakdown.
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Time period for a magnet is T. If it is divided in four equal parts along its axis and perpendicular to its axis as shown then time period for each part will be
| (a) 4T | (b) T/4 | (c) T/2 | (d) T |
In Young's double slit interference experiment, the slit separation is made 3 fold. The fringe width becomes
|
(a) 1/3 times |
(b) 1/9 times |
(c) 3 times |
(d) 9 times |
A voltmeter has resistance of 2000 ohms and it can measure upto 2V. If we want to increase its range to 10 V, then the required resistance in series will be
|
(a) 2000 Ω |
(b) 4000 Ω |
(c) 6000 Ω |
(d) 8000 Ω |
The field due to a magnet at a distance R from the centre of the magnet is proportional to
|
(a) |
(b) |
(c) |
(d) |
How can we explain the reddish appearance of sun at sunrise or sunset?
A wire has a resistance of 12 ohm. It is bent in the form of equilateral triangle. The effective resistance between any two corners of the triangle is
|
(a) 9 ohms |
(b) 12 ohms |
(c) 6 ohms |
(d) 8/3 ohms |
