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The network shown in the figure is a part of a complete circuit. If at a certain instant the current i is 5 A and is decreasing at the rate of 
then 
is
|
(a) 5 V |
(b) 10 V |
(c) 15 V |
(d) 20 V |
White light may be considered to be a mixture of waves with l ranging between 3900 Å and 7800 Å. An oil film of thickness 10,000 Å is examined normally by reflected light. If m = 1.4, then the film appears bright for
|
(a) 4308 Å, 5091 Å, 6222 Å |
(b) 4000 Å, 5091 Å, 5600 Å |
|
(c) 4667 Å, 6222 Å, 7000 Å |
(d) 4000 Å, 4667 Å, 5600 Å, 7000Å |
A varying current at the rate of 3 A/s in a coil generates an e.m.f. of 8 mV in a nearby coil. The mutual inductance of the two coils is
|
(a) 2.66 mH |
(b) 2.66 |
(c) 2.66 H |
(d) 0.266 H |
If n drops, each of capacitance C, coalesce to form a single big drop, then the ratio of the energy stored in the big drop to that in each small drop will be
|
(a) n : 1 |
(b) n1/3 : 1 |
(c) n5/3 : 1 |
(d) n2 : 1 |
Which of the following transition will have highest emission wavelength
|
(a) n = 2 to n = 1 |
(b) n = 1 to n = 2 |
(c) n = 2 to n= 5 |
(d) n = 5 to n = 2 |
