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Ohm’s law is valid if

A cube of side a has charge q at two diagonally opposite vertices as shown in the figure. The net electric potential at the centre of the cube will be

 

If q₁ + q₂ = 3q, then the value of the q₁/q₂, for which the force of repulsion between q₁ and q₂ is maximum is

A set of 16 tuning forks are so arranged that each produce 4 beats with the previous one. If the frequency of last tuning fork is double that of first, the frequency of third tuning fork is

A pipe open at both ends produces a note of fundamental frequency V₁. When the pipe is kept with (1/3)^rd of its length in water, it produces a note of frequency V₂.The value of V₁/ V₂ is

A string of linear density 0.4 kg/m is stretched with force of 1000 N. A transverse wave is set up along it. The speed of the wave is

The latent heat of vaporisation of substance is

The bulk modulus of a spherical object is B. If it is subjected to uniform pressure P, the fractional decrease in surface area is

Heat is supplied to an ideal monoatomic gas at constant pressure. The ratio of

Two capillary tube of radii 0.3 cm and 0.4 cm are dipped in the same liquid. The ratio of respective heights through which liquid will rise, is

A mass m attached to a spring oscillates with a time period 4 s. If the mass is increased by 1 kg, then period increases by 1 s. Its initial mass is

The equation y = acos²ωt + asin²ωt is

If the earth suddenly stop rotating, the value of ‘g’ at the equator would

A particle of mass m is moving in a plane along a circular path of radius r. Its angular momentum about the axis is L. The centripetal force acting on the particle is