- ADC.
- BAC.
- CDC as well as AC.
- DNeither AC nor DC.
Explanation:
$\text{X}_\text{C}\frac{1}{\omega\text{C}}=\frac{1}{0\times\text{C}}$ $\bigg\{\text{in}\stackrel{{\text{DC}}}{{\omega = 0 }}\bigg\}$
$=\infty$
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The equivalent resistance between the points P and Q of the circuit given is
|
(a) |
(b) |
(c) 4 R |
(d) 2 R |
A light of wavelength 5890 Å falls normally on a thin air film. The minimum thickness of the film such that the film appears dark in reflected light
|
(a) 2.945 |
(b) 3.945 |
(c) 4.95 |
(d) 1.945 |
An electric wire of length ‘I’ and area of cross-section a has a resistance R ohms. Another wire of the same material having same length and area of cross-section 4a has a resistance of
|
(a) 4R |
(b) R/4 |
(c) R/16 |
(d) 16R |
Total internal reflection of light is possible when light enters from
|
(a) Air to glass |
(b) Vacuum to air |
(c) Air to water |
(d) Water to air |
Two infinitely long parallel wires carry equal current in same direction. The magnetic field at a mid point in between the two wires is
|
(a) Twice the magnetic field produced due to each of the wires |
|
(b) Half of the magnetic field produced due to each of the wires |
|
(c) Square of the magnetic field produced due to each of the wires |
|
(d) Zero |