Magnetism And Matter — Physics STD 12 Science — Question

In the Young's double slit experiment, the ratio of intensities of bright and dark fringes is 9. This means that

(a) The intensities of individual sources are 5 and 4 units respectively

(b) The intensities of individual sources are 4 and 1 units respectively

(c) The ratio of their amplitudes is 2

(d) b, c

Consider the situation shown in the figure. The wire AB is sliding on the fixed rails with a constant velocity. If the wire AB is replaced by semicircular wire, the magnitude of the induced current will

(a) Increase

(b) Remain the same

(c) Decrease

(d) Increase or decrease depending on whether the semicircle bulges towards the resistance or away from it

The ground state energy of hydrogen atom is -13.6 eV. The kinetic and potential energies of the electron in this state are:

The resistance of a galvanometer is 90 ohms. If only 10 percent of the main current may flow through the galvanometer, in which way and of what value, a resistor is to be used

(a) 10 ohms in series	(b) 10 ohms in parallel
(c) 810 ohms in series	(d) 810 ohms in parallel

A circular loop carrying a current is replaced by ann equivalent magnetic dipole. A point on the axis of the loop is in:

The point representing reso- nant condition in the figure given is:

Which of the following (referred to a spherical mirror) do (does) not depend on whether the rays are paraxial or not?

1. Pole.
2. Focus.
3. Radius of curvature.
4. Principal axis.

If a charged particle at rest experiences no electromagnetic force:

Two identical thin bar magnets each of length l and pole strength m are placed at right angle to each other with north pole of one touching south pole of the other. Magnetic moment of the system is

(a) ml

(b) 2ml

(c)

(d)