In an isolated parallel plate capacitor of capacitance C, the four surface have charges 
and 
as shown. The potential difference between the plates is
|
(a) |
(b) |
(c) |
(d) |
(c)
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Magnifying power of a simple microscope is (when final image is formed at D = 25 cm from eye)
|
(a) |
(b) 1 + |
(c) |
(d) |
The maximum efficiency of full wave rectifier is
|
(a) 100% |
(b) 25.20% |
(c) 40.2% |
(d) 81.2% |
$\overrightarrow{\text{F}}\times\overrightarrow{\text{a}}$
$\overrightarrow{\text{v}}\times\overrightarrow{\text{r}}$
$\overrightarrow{\text{a}}\times\overrightarrow{\text{r}}$
$\overrightarrow{\text{F}}\times\overrightarrow{\text{r}}$
When a wire loop is rotated in a magnetic field, the direction of induced e.m.f. changes once in each
|
(a) |
(b) |
(c) 1 revolution |
(d) 2 revolution |
