The equivalent resistance between the points P and Q in the network given here is equal to (given r = )
|
(a) |
(b) 1 W |
(c) |
(d) 2 W |
The equivalent resistance between the points P and Q in the network given here is equal to (given r = )
|
(a) |
(b) 1 W |
(c) |
(d) 2 W |
(b) 1 W
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The intensity of the electric field required to keep a water drop of radius just suspended in air when charged with one electron is approximately (g = 10 newton/kg e = 1.6
|
(a) 260 volt/cm |
(b) 260 newton/coulomb |
|
(c) 130 volt/cm |
(d) 130 newton/coulomb |
A star emits light of 5500 Å wavelength. Its appears blue to an observer on the earth, it means
|
(a) Star is going away from the earth |
(b) Star is stationary |
|
(c) Star is coming towards earth |
(d) None of the above |
A solid conducting sphere having a charge Q is surrounded by an uncharged concentric conducting hollow spherical shell. Let the potential difference between the surface of the solid sphere and that of the outer surface of the hollow shell be V. If the shell is now given a charge of –3Q, the new potential difference between the same two surfaces is
|
(a) V |
(b) 2V |
(c) 4V |
(d) – 2V |
In Young's experiment, light of wavelength 4000 Å is used to produce bright fringes of width 0.6 mm, at a distance of 2 meters. If the whole apparatus is dipped in a liquid of refractive index 1.5, then fringe width will be
|
(a) 0.2 mm |
(b) 0.3 mm |
(c) 0.4 mm |
(d) 1.2 mm |
Charge q is uniformly distributed over a thin half ring of radius R. The electric field at the centre of the ring is
|
(a) |
(b) |
(c) |
(d) |
Consider the following two statements: