- A$\frac{ C }{ L }$
- B$\frac{1}{ RC }$
- ✓$\frac{ L }{ R }$
- D$\frac{ RL }{ C }$
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The resultant capacitance between A and B in the following figure is equal to
|
(a) 1 μF |
(b) 3 μF |
(c) 2 μF |
(d) 1.5 μF |
Shown in the figure here is a convergent lens placed inside a cell filled with a liquid. The lens has focal length + 20 cm when in air and its material has refractive index 1.50. If the liquid has refractive index 1.60, the focal length of the system is
|
(a) + 80 cm |
(b) – 80 cm |
(c) – 24 cm |
(d) –100 cm |
The magnitude of the earth’s magnetic field at a place is
and the angle of dip is δ. A horizontal conductor of length l lying along the magnetic north-south moves eastwards with a velocity v. The emf induced across the conductor is
|
(a) Zero |
(b) |
(c) |
(d) |
A step index fibre has a relative refractive index of 0.88%. What is the critical angle at the corecladding interface
|
(a) 60° |
(b) 75° |
(c) 45° |
(d) None of these |
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 |
Voltmeters V1 and V2 are connected in series across a D.C. line. V1 reads 80 volts and has a per volt resistance of 200 ohms. V2 has a total resistance of 32 kilo ohms. The line voltage is
|
(a) 120 volts |
(b) 160 volts |
(c) 220 volts |
(d) 240 volts |
The magnetic susceptibility is
|
(a) |
(b) |
(c) |
(d) |