The capacitance of a parallel plate capacitor without any medium between its plates is given by When a dielectric completely fills the space between the plates of the capacitor, the capacitance increases K times, where K is the dielectric constant (relative permitivity) of the dielectric. If a dielectric slab of thickness t (<d) is introduced…… Continue reading EFFECT OF DIELECTRIC IN A CAPACITOR

Centre of mass of an accelerated body

“What is the effect on centre of mass of system of particles when it is placed in accelerated train?” Vimal asked
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Explain IMPULSE in simple terms

Vimal asked this question. Impulse is the effect of a force and is measured as the change in momentum produced. The same effect, that is the same change in momentum can be produced by a large force acting for a short interval of time, a small force acting for a large interval of time or a moderate […]

What is diamagnetism ?

What is diamagnetism? (Shan asked)
Diamagnetism is the property of an object which causes it to create a magnetic field in opposition to an externally applied magnetic field, thus causing a repulsive effect. (Wikipedia)
Please refer to the following li…

Class 12 Physics Study materials – Free Download

Class 12 students can download study materials in Physics here. The materials are prepared by experts in the field and can be used for first time study or  for a quick revision. Electrostatics Current Electricity Magnetic Effect of Current and Magnetism Electromagnetic induction and AC Electromagnetic Waves Optics Dual Nature of matter and energy Atoms […]

Why ordinary ammeter cannot measure AC?

Ac changes its direction frequently and therefore the ordinary ammeter which is just a galvanometer with a shunt, tends to respond to the magnitude and direction of the instantaneous values of current and in effect it will not show any deflection. Ac is measured using hot wire ammeter, which is based on the heating effect…… Continue reading Why ordinary ammeter cannot measure AC?