In Young's double slit experiment, the slits are 0.5 mm apart and interference pattern is observed on a screen placed at a distance of 1.0 m from the plane containing the slits. If wavelength of the incident light is 6000 Å, then the separation between the third bright fringe and the central maxima is
|
(a) 4.0 mm |
(b) 3.5 mm |
(c) 3.0 mm |
(d) 2.5 mm |
(b) 3.5 mm
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A current of 10A is passing through a long wire which has semicircular loop of the radius 20cm as shown in the figure. Magnetic field produced at the centre of the loop is
|
(a) 10 πμT |
(b) 5 πμT |
(c) 4 πμT |
(d) 2 πμT |
An electric bulb marked 40 W and 200 V, is used in a circuit of supply voltage 100 V. Now its power is
|
(a) 100W |
(b) 40W |
(c) 20W |
(d) 10W |
$\lambda_\text{e}=\lambda_\text{p}.$
$\lambda_\text{e}<\lambda_\text{p}.$
$\lambda _\text{e}>\lambda_\text{p}.$
The relation between
A circular coil ‘A’ has a radius R and the current flowing through it is I. Another circular coil ‘B’ has a radius 2R and if 2I is the current flowing through it, then the magnetic fields at the centre of the circular coil are in the ratio of (i.e. 
to
)
|
(a) 4 : 1 |
(b) 2 : 1 |
(c) 3 : 1 |
(d) 1 : 1 |
A circular loop of radius R carrying current I lies in x-y plane with its centre at origin. The total magnetic flux through x-y plane is
|
(a) Directly proportional to I |
(b) Directly proportional to R |
|
(c) Directly proportional to |
(d) Zero |
An artificial radioactive decay series begins with unstable 
. The stable nuclide obtained after eight α - decays and five β- decays is
|
(a) |
(b) |
(c) |
(d) |
