VITEEE 2017 :: Physics :: General questions

• Physics - General questions

 If the light is polarised by reflection, then the angle between reflected and refracted light is

Answer:

Explanation:

On polarization by reflection, the reflected and refracted waves are at 90° to each other.

Two capacitors C1and C₂ in a circuit are joined as shown in figure. The potentials of points A and B are V₁ and V₂ respectively. Then the potential of point D will be

Answer:

Explanation:

Consider the potential at D be 'V'.

Potential drop across C₁ is (V - V₁) and C₂ is (V - V)

.'. q₁ = C₁ (V - V₁), q₂ = C₂ (V₂ - V)

As q₁ = q₂ [capacitors are in series]

.'. C₁ (V - V₁) = C₂ (V₂ - V) 

V = $\frac{C_{1}V_{1}+C_{2}V_{2}}{C_{1}+C_{2}}$

The Potential energy of a system increases if  work is done 

Answer:

Explanation:

When work is done upon a system by a conservative force then its potential energy increases.

A charge +q is at a distance L/2 above a square of side L. Then what is the flux linked with the surface?

Answer:

Explanation:

The given square of side L may be considered as one of the faces of a cube with edge L.Then given charge q will be considered to be placed at the centre of the cube. Then according to Gauss's theorem, the magnitude of the electric flux through the faces (six) of the cube is given by

$\phi = \frac{q}{\epsilon_{0}}$

Hence, electric flux through one face of the cube for the given square will be

$\phi' = \frac{1}{6}\phi=\frac{q}{6\epsilon_{0}}$

Which of the following are not electromagnetic waves?

Answer:

Explanation:

Cosmic rays are coming from outer space, having high energy charged particles, like a-particle, proton etc. β-rays are a stream of high energy electrons, coming from the nucleus of radioactive atoms.

• Physics - General questions