The relation between voltage sensitivity (
) and current sensitivity (
) of a moving coil galvanometer is (Resistance of Galvanometer = G)
|
(a) |
(b) |
(c) |
(d) |
(a) 
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$\frac{\text{v}}{4}$
$\frac{\text{v}}{2}$
$\text{v}$
$2\text{v}$
Two spheres of radius a and b respectively are charged and joined by a wire. The ratio of electric field of the spheres is
|
(a) a/b |
(b) b/a |
(c) |
(d) |
The time period of a thin bar magnet in earth’s magnetic field is T. If the magnet is cut into two equal parts perpendicular to its length, the time period of each part in the same field will be
|
(a) |
(b) T |
(c) |
(d) 2T |
In the figure the charge Q is at the centre of the circle. Work done is maximum when another charge is taken from point P to
|
(a) K |
(b) L |
(c) M |
(d) N |
Solid targets of different elements are bombarded by highly energetic electron beams. The frequency (f) of the characteristic X-rays emitted from different targets varies with atomic number Z as
|
(a) f ∝ |
(b) f ∝ |
(c) f ∝ Z |
(d) f ∝ |
Which is reverse biased diode
|
(a)
|
(b)
|
(c)
|
(d)
|
A concave mirror of focal length 15 cm forms an image having twice the linear dimensions of the object. The position of the object when the image is virtual will be
|
(a) 22.5 cm |
(b) 7.5 cm |
(c) 30 cm |
(d) 45 cm |
