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. […]
Science > Physics > Magnetic Effect of Electric Current > Ammeter and Voltmeter Ammeter: An ammeter is an electrical measurement device (apparatus) which is used to measure the electric current in the electrical circuit. Requirements of Good Ammeter: The resistance of an ammeter must be as small as possible. The ideal resistance of an ammeter […]
Science > Physics > Magnetic Effect of Electric Current > Moving Coil Galvanometer In this article, we shall study principle, construction, working, sensitivity and accuracy of the moving coil galvanometer Principle: When a current-carrying coil is suspended in a uniform magnetic field it is acted upon by a torque. Under the action of this torque, […]