Physics

Current I is flowing in infinitely long wire. Which of the following graphs represents the variation of B w.r.t. axial distance r from the axis of wire :-

A capacitor of 20 μF is charged to 500 volt and a capacitor 10μF is charged to 200 volt and connected. Then after connecting both of them, the common potential for each will be :–

A galvanometer of resistance 20Ω is to be converted into an ammeter of range 1A. If a current of 1 mA produces full scale deflection, the shunt required for the purpose is :-

If heat produced in 4Ω is H cal/sec. then in 6Ω it is :– (in cal/sec.)

If an insulated non conducting sphere of radius R has charge density ρ, the electric field at a distance r from the centre of sphere (r < R) will :-

Three charges Q,(+q) and (+q) are placed at the vertices of an equilateral triangle of side ℓ as shown in the figure. If the net electrostatic energy of the system is zero, then Q is equal to :-

 

If the distance between successive compressions and rarefaction in a sound wave is 2 m and velocity of sound is 360 m/s, then the frequency is

The radii of circular orbits of two satellites A and B of the earth, are 4R and R, respectively. If speed of satellite A is 2V, then the speed of satellite B will be

Is there a law of quantisation for mass, just like the quantisation of charge?

How can we say that the additivity of electric charges is much different from the simple addition of mass?