If two coherent source are placed at a distance `3lambda` from each other, symmetric to the centre of the circel as shown in figure, Find thenumber of fringes shown on the screen, placed along the circumference ?

Two magnets are placed at a distance from each other on a frictionless surface, as shown in the given figure. The magnets will experience

A point light source of 100W is placed at a distance x from the centre ofa hole ofradius R in a sheet as shown in figure, Find the power passing through the hole in sheet

Two coherent light sources A and B are at a distance 3lambda from each other (lambda =wavelength)The distances from A on the X-axis at which the interference is constructive are

In a system of two dipoles placed in the way as shown in figure :

Two coherent light sources S_1 and S_2 (lambda=6000Å) are 1mm apart from each other. The screen is placed at a distance of 25cm from the sources. The width of the fringes on the screen should be

Two coherent point sources S_1 and S_2 are separated by a small distance d as shown. The fringes obtained on the screen will be

The distance between two coherent sources is 1 mm. The screen is placed at a distance of 1 m from the sources. If the distance of the third bright fringe is 1.2 mm from the central fringe, the wavelength of light used is

Two monochromatic and coherent point sources of light are placed at a certain distance from each other in the horizontal plane. The locus of all thos points in the horizontal plane which have constructive interference will be-

3 charges are placed in a circle of radius d as shown in figure. Find the electric field along x-axis at centre of circle.