Science > Physics > Current Electricity > Potentiometer In this article, we shall study the principle, construction, and working of a potentiometer and its uses. Principle of Potentiometer: When a steady current flows through a wire of uniform cross-section the potential difference per unit length of the wire is constant throughout the length of the […]
Science > Physics > Current Electricity > Numerical Problems on Wheatstone’s Metre Bridge 02 Example – 15: In Wheatstone’s metre bridge experiment with unknown resistance X in the left gap and 60 Ω resistance in a right gap null point is obtained at l cm from the left end. If the unknown resistance is shunted by equal resistance, […]
Science > Physics > Current Electricity > Numerical Problems on Wheatstone’s Metre Bridge 01 In this article and the next article, we shall study numerical problems based on Wheatstone’s metre bridge. Example – 01: A resistance of 10 Ω is connected in a left gap of a metre bridge. Two resistors of 20 Ω and 16 Ω are […]
Science > Physics > Current Electricity > Kirchhoff’s Laws In this article, we shall study Kirchhoff’s laws, construction, working and uses of Wheatstone’s metre bridge. There are two Kirchhoff’s laws viz: current law or junction law and voltage law or mesh law. Kirchhoff’s Current Law or Kirchhoff’s Junction Law: Statement: In an electric network, the algebraic sum of […]
Science > Physics > Current Electricity > Temperature Dependence of Resistance In this article, we shall study the effect of temperature on the value of resistance and thermistors and their uses. A metallic conductor consists of a large number of free electrons. These electrons are always in a state of random motion. When a potential […]
Science > Physics > Current Electricity > Introduction In this article, we shall study the concept of current electricity, the resistance, ohm’s law, and the conductance of a conductor. Electric Current Through Conductor: A conductor is made up of very minute particles called atoms. Atoms consist of a positively charged nucleus and negatively charged electrons […]
Science > Physics > Magnetic Effect of Electric Current > Biot-Savart’s Law In this article, we shall study Biot-Savart’s Law and its application to find the magnetic induction at a point due to current carrying infinitely long conductor and the magnetic induction at the centre of a current-carrying circular coil. Magnetic Induction: The magnetic induction […]
Science > Physics > Magnetic Effect of Electric Current > Magnetic Effect of Electric Current In this article, we shall study the magnetic effect of electric current and its applications. Oersted’s Experiment: Oersted performed an experiment to show the magnetic effect of electric current. He took long conducting wire and aligned it in magnetic meridian […]
Science > Physics > Magnetic Effect of Electric Current > Cyclotron The device which uses the electric or magnetic field to guide and accelerate a beam of charged particles to high speed is called a particle accelerator. Charged particles used may be protons or electrons. These high-velocity particles are used in nuclear physics and high […]
Science > Physics > Magnetic Effect of Electric Current > Tangent Galvanometer In this article, we shall study, the principle, construction, working, sensitivity, and accuracy of the tangent galvanometer. Principle: The tangent galvanometer works on the principle of tangent law. The magnetic needle is subjected to two magnetic fields which are perpendicular to each other. […]