Explanation:
$\text{Z}_\text{L}=\text{WL}\ \ \ \text{Z}_\text{C}=\frac{1}{\text{WC}}$
$\text{w}\uparrow,\text{Z}_\text{L}\uparrow\text{Z}_\text{c}\downarrow$
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A metallic shell has a point charge ‘q’ kept inside its cavity. Which one of the following diagrams correctly represents the electric lines of forces
|
(a)
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(b)
|
(c)
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(d)
|
The unit of magnetic moment is
|
(a) Wb/m |
(b) |
(c) A.m |
(d) |
A rocket is going away from the earth at a speed of 106 m/s If the wavelength of the light wave emitted by it be 5700 Å, what will be its Doppler's shift
|
(a) 200 Å |
(b) 19 Å |
(c) 20 Å |
(d) 0.2 Å |
White light is incident on the interface of glass and air as shown in the figure. If green light is just totally internally reflected then the emerging ray in air contains
|
(a) Yellow, orange, red |
(b) Violet, indigo, blue |
|
(c) All colours |
(d) All colours except green |
Armature current in dc motor will be maximum when
|
(a) Motor has acquired maximum speed |
(b) Motor has acquired intermediate speed |
|
(c) Motor has just started moving |
(d) Motor is switched off |
The field due to a long straight wire carrying a current I is proportional to
|
(a) I |
(b) |
(c) |
(d) 1/I |
