The capacitance of an air capacitor is 15 μF the separation between the parallel plates is 6mm. A copper plate of 3mm thickness is introduced symmetrically between the plates. The capacitance now becomes
|
(a) 5 μF |
(b) 7.5 μF |
(c) 22.5 μF |
(d) 30 μF |
(d) 30 μF
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The graph between wave number (
) and angular frequency (w) is
|
(a)
|
(b)
|
(c)
|
(d)
|
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 |
An aeroplane in which the distance between the tips of wings is 50 m is flying horizontally with a speed of 360 km/hr over a place where the vertical components of earth magnetic field is 2.0 
. The potential difference between the tips of wings would be
|
(a) 0.1 V |
(b) 1.0 V |
(c) 0.2 V |
(d) 0.01 V |
A point object is placed at a distance of 30 cm from a convex mirror of focal length 30cm. The image will form at
|
(a) Infinity |
(b) Focus |
|
(c) Pole |
(d) 15 cm behind the mirror |
