When a 12 Ω resistor is connected with a moving coil galvanometer then its deflection reduces from 50 divisions to 10 divisions. The resistance of the galvanometer is
|
(a) 24 Ω |
(b) 36 Ω |
(c) 48 Ω |
(d) 60 Ω |
(c) 48 Ω
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At what distance from a convex lens of focal length 30 cm, an object should be placed so that the size of the image be 1/2 of the object
|
(a) 30 cm |
(b) 60 cm |
(c) 15 cm |
(d) 90 cm |
$\overrightarrow{\text{R}}=\frac{1}{\text{M}}\sum\limits_{\text{i}}\text{m}_\text{i}\overrightarrow{\text{r}}_\text{i}$
$\overrightarrow{\text{a}}_\text{cm}=\frac{\overrightarrow{\text{F}}}{\text{M}}$
The equivalent capacitance in the circuit between A and B will be
|
(a) 1 μF |
(b) 2 μF |
(c) 3 μF |
(d) |
Finger prints are observed by the use of:
