Ampere’s Law
The line integral for a closed curve is equal to times the net current I threading through the area bounded by the curve.
Proof:
Oersted’s experiment
Take a magnetic needle NS, which can rotate freely about a vertical axis in a horizontal plane. Hold a conducting wire AB over the...
Magnetic Field
If the charge q is projected from point P in the direction of the current, it is deflected towards the wire (q is assumed...
Potentiometer
A potentiometer is a device used to measure an unknown emf or potential difference accurately.
The potentiometer is a device to compare potential differences. Since...
Wheatstone bridge
It is an arrangement of four resistance used to determine one of this resistance quickly and accurately in terms of the remaining three resistances.
The...
Meter Bridge or slide Wire Bridge
It is the simplest practical application of the Wheatstone bridge that is used to measure an unknown resistance.
Principle: Its working is based on the...
Kirchhoff’s Rules
Electric circuits generally consist of a number of resistors and cells interconnected sometimes in a complicated way. The formulae we have derived earlier for...
Distinction between EMF and Potential Difference
Distinction between EMF and Potential Difference
Combination of Resistors- Series And Parallel
Combination of Resistors- Series
The current through a single resistor R across which there is a potential difference V is given by Ohm’s law I...
Combination of cells in series And Parallel
Combination of cells in series
When external resistance is negligible in comparison to the internal resistance, then the cells are connected in parallel to get maximum...