Electrostatic Potential and Capacitance — Physics STD 12 Science — Question

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

The dimensions of polarisation are:

Variation of current passing through a conductor as the voltage applied across its ends as varied is shown in the adjoining diagram. If the resistance (R) is determined at the points A, B, C and D, we will find that

(a) RC = RD

(b) RB > RA

(c) RC > RB

(d) None of these

According to Newton, different colors of light are due to the difference in _______ of the corpuscles.

If a radioactive element is placed in an evacuated chamber, then the rate of radioactive decay will:

A magnet is made to oscillate with a particular frequency, passing through a coil as shown in figure. The time variation of the magnitude of e.m.f. generated across the coil during one cycle is

(a)	(b)
(c)	(d)

Coulomb's law is a confirmation of______

If  millimho, then on increasing plate voltage by  50 V, how much the grid voltage is changed so that plate current remains the same

(a) – 2.86 V

(b) –  4 V

(c) + 4 V

(d) + 2 V