NCERT Ac generator for class 12 pdf Class 12 Physics PDF NCERT Solutions Class 12 Physics PDF format is available for free download. S L Arora, Concepts of Physics by H C Verma, Pradeep’s fundamental physics, A B C Physics, Arihant publications books, Full Marks question bank etc.

JEE Mains and Advance, NEET, BITSAT, GGSIPU use latest books available in the market. Practice Book including board questions and entrance exam questions with solutions. How much electrostatic energy is stored in the capacitor? If another capacitor of 6 pf is connected in series with it with the same battery connected across the combination, find the charge stored and potential difference across each capacitor. Derive the expression for the electric potential due to an electric dipole at a point on its axial line. Depict the equipotential surfaces due to an electric dipole.

A wire whose cross sectional area is increasing linearly from its one end to the other, is connected across a battery of V volts. Which of the following quantities remain constant in the wire? Explain briefly how these rules are justified. The current is drawn from a cell of emf E and internal resistance r connected to the network of resistors each of resistance r as shown in the figure. A resistance of R draws current from a potentiometer. The potentiometer wire, AB, has a total resistance of R0.

A voltage V is supplied to the potentiometer. Derive an expression for the voltage across R when the sliding contact is in the middle of potentiometer wire. Write the expression for current sensitivity of the galvanometer. Can a galvanometer as such be used for measuring the current?

Show that it behaves like a tiny magnetic dipole. L, where L is the orbital angular momentum of the electron. Give the significance of negative sign. What is the value of horizontal component of the Earth’s magnetic field at equator? If the current through the wire increases, will there be an increase induced emf in the loop? Self Inductance’ and write its S.

Obtain the expression for the mutual inductance of two long co-axial solenoids S1 and S2 wound one over the other, each of length L and radii r1 and r2 and n1 and n2 number of terns per unit length, when a current I is set up in the outer solenoid S2. Draw a labelled diagram of AC generator. Derive the expression for the instantaneous value of the emf induced in the coil. A circular coil of cross-sectional area 200 sq. Calculate the maximum value of the current in the coil.

Obtain the ratio of secondary to primary voltage in terms of number of turns and currents in the two coils. A power transmission line feeds input power at 2200 V to a step-down transformer with its primary windings having 3000 turns. Find the number of turns in the secondary to get the power output at 220 V. Find the value of the phase difference between the current and the voltage in the series LCR circuit shown below. Which one leads in phase: current or voltage? Without making any other change, find the value of the additional capacitor C1, to be connected in parallel with the capacitor C, in order to make the power factor of the circuit unity. How does Ampere-Maxwell law explain the flow of current through a capacitor when it is being charged by a battery?

Write the expression for the displacement current in terms of the rate of change of electric flux. Calculate the speed of light through the prism. Find the angle of incident at face AB so that the emergent ray grazes along the face AC. Rashmi Singh broke her reading glasses. When she went to the shopkeeper to order new spects, he suggested that she should get spectacles with plastic lenses instead of glass lenses.

On getting the new spectacles, she found that the new ones could not offer satisfactory explanation for this. Singh raised the same question to her daughter Anuja who explained why plastic lenses were thicker. Distinguish between unpolarised light and linearly polarised light. How does one get linearly polarised light with the help of a Polaroid?