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There exists a uniform electric field in the space as shown. Four point6s A, B, C and D are marked which are equidistant from the origin. If Va, Vb , Vc and Vd are their potentials , then B C and D are marked which are equidistant from the origin. If Va then There exists [...]

Consider two thin uniformly charged concentric shells of radii r and 2r having charges Q and -Q respectively, as shown. Three points A, B and C are marked at distnaces r/2, 3r/2 and 5r/2 respectively from their common centre. If Ea , Eb and Ec are magnitudes of the electric fields at points A, B, [...]

The temperatures of source and sink of a heat engine are 127 degree and 27 degree respectively. An inventor clams its efficiency to be 26%, then, The temperatures of source and sink of a heat engine are 127 degree and 27 degree respectively. An inventor clams its efficiency to be 26% then September 16, 2020 [...]

If λm​ denotes the wavelength at which the radioactive emission from a black body at a temperature T K is maximum, then: If λm​ denotes the wavelength at which the radioactive emission from a black body at a temperature T K is maximum then September 16, 2020 Category: Chapter 17 - Thermal Properties of Matter [...]

For a given velocity, a projectile has the same range R for two angles of projection. If t1​ and t2​ are the time of flight in the two cases, then: a projectile has the same range R for two angles of projection. If t1​ and t2​ are the time of flight in the two cases [...]

Let e0 denote the dimensional formula of the permittivity of vacuum and mo 0 that the permeability of vacuum. If M = mass, L = length, T = time, and I = electric current , then and I = electric current L = length Let e0 denote the dimensional formula of the permittivity of vacuum [...]

B1​, B2​, and B3​ are three balloons ascending with velocities v,2v, and 3v, respectively. If a bomb is dropped from each when they are at the same height, then 2v and 3v and B3​ are three balloons ascending with velocities v B1​ B2​ respectively. If a bomb is dropped from each when they are at [...]

A satellite is launched into a circular orbit of radius R around the earth. A second satellite is launched into an orbit of radius 1.01R. The period of second satellite is larger than the first one by approximately An asteroid of mass m is approaching earth initially at a distance 10 RE with speed vi. [...]

An asteroid of mass m is approaching earth, initially at a distance 10 RE with speed vi. It hits earth with a speed vf (RE and ME are radius and mass of earth),. Then An asteroid of mass m is approaching earth initially at a distance 10 RE with speed vi. It hits earth with [...]

When two point charges qA and qB are placed at some separation on positive x-axis at points ( xA , 0) and ( xB, 0). Given that |qA| and |qB| and xB > xA. If null point is the point where net electric field due to both the charges is zero, then 0) and ( [...]