Explanation:
For angular momentum. we have:
$\overrightarrow{\text{L}}=\text{m}\Big(\overrightarrow{\text{r}}\times\overrightarrow{\text{v}}\Big)$
$\overrightarrow{\text{v}}=\text{v}\hat{\text{i}}$ and $\overrightarrow{\text{r}}=\text{x}\hat{\text{i}}+\text{y}\hat{\text{j}}$
So, $\overrightarrow{\text{L}}=-\text{mvy}\hat{\text{k}}$
m, v and y are constant; therefore, angular momentum remains constant.
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Two capacitors of equal capacity are first connected in parallel and then in series. The ratio of the total capacities in the two cases will be
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(a) 2 : 1 |
(b) 1 : 2 |
(c) 4 : 1 |
(d) 1 : 4 |
In Young's double slit experiment, carried out with light of wavelength l = 5000 Å, the distance between the slits is 0.2 mm and the screen is at 200 cm from the slits. The central maximum is at x = 0. The third maximum (taking the central maximum as zeroth maximum) will be at x equal to
|
(a) 1.67 cm |
(b) 1.5 cm |
(c) 0.5 cm |
(d) 5.0 cm |
Which of the following phenomena contributes significantly to the reddish appearance of the sun at sunrise or sunset?
In the propagation of electromagnetic waves the angle between the direction of propagation and plane of polarisation is
|
(a) 0o |
(b) 45o |
(c) 90o |
(d) 180o |
A potentiometer consists of a wire of length 4 m and resistance 10Ω. It is connected to a cell of e.m.f. 2 V. The potential difference per unit length of the wire will be
|
(a) 0.5 V/m |
(b) 2 V/m |
(c) 5 V/m |
(d) 10 V/m |
Which of the following law is used in the Millikan's method for the determination of charge
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(a) Ampere's law |
(b) Stoke's law |
|
(c) Fleming's left hand rule |
(d) Fleming's right hand rule |