Electrical Potential Energy

Introduction Electrical Potential Energy or Electrostatic Potential Energy is defined as the energy that arises from the collection of charges when the charge will exert a force on any other charge. It is the total amount of work done in the bringing the charges from an infinite distance to their respective positions in the system. […]

Electron Emission And Its Types

What is Electron Emission? Metals have free electrons that can move from one atom to the other within the metal. In fact, this factor is responsible for their excellent electrical conductivity. But if they try to escape the metal surface, they are unable to do so. This is because when these negatively charged particles (electrons) […]

Conservation Of Linear Momentum

Linear momentum We have seen quantities like velocity, acceleration, mass etc. and know what they signify. Now we will define a quantity known as momentum which is mathematically represented as: P = mv which is the amount of motion a body possess. As it is a product of mass and velocity so like velocity it […]

Transistor as a device – Switch…

We have read about the configurations in which the transistor can be connected; namely CB, CC and CE, the biasing of the E-B and B-C junction and the regions of operations; namely cutoff, the active region, and the saturation region. We also know that the transistor when used in the cutoff or saturation state, acts […]

Electric Current : The Flow Of Charge

Our ancestors relied on fire for light, warmth and cooking. Today at the flick of a switch, turn of a knob or the push of a button we have instant power. This is possible because of electric current. Electric current is one of the important discoveries that helped us revolutionise the way we live. From […]

The Electric Field of a Dipole

A dipole is a separation of opposite electrical charges and it is quantified by an electric dipole moment. The electric dipole moment associated with two equal charges of opposite polarity separated by a distance ‘d ’ is defined as the vector quantity having a magnitude equal to the product of the charge and the distance […]

Current Electricity

A few minutes of power outage makes us realise how important electric current is to us. Many inventions and discoveries have been made in order to facilitate the human life smoothly. The discovery of current electricity is one such discovery that we are highly dependent on to make our life easier. Here, in this article […]

Fermi Energy

In Physics, the concept of energy is tricky because it has different meanings depending on the context. For example, in atoms and molecules, energy comes in different forms such as light energy, electrical energy, heat energy, etc. In quantum mechanics, it gets even trickier. In this branch of physics, scientists rely on concepts like Fermi […]

Principle Of Superposition Of Waves

The principle of superposition of waves, the net response for all linear systems at a given time for a given place, caused by two or more stimuli, is the sum of responses which would have been caused by each stimulus individually. So, if the response produced by input A is X and that produced by […]


Calorimetry is the field of science that deals with the measurement of the state of a body with respect to the thermal aspects in order to examine its physical and chemical changes. The changes could be physical such as melting, evaporation etc or could also be chemical such as burning, acid-base neutralization etc. Calorimeter is […]

Practise This Question

A cyclist riding the bicycle at a speed of 143ms1 takes a turn around a circular road of radius 203 m without skidding.  Given g=9.8ms2, what is his inclination to the vertical m