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Physics

Temperature Dependence of Resistance

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 […]

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Physics

Introduction to Current Electricity

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 […]

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Physics

Biot-Savart’s Law

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 […]

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Physics

Introduction to Magnetic Effect of Electric Current

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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 […]

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Physics

Cyclotron

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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 […]

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Physics

Tangent Galvanometer

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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. […]

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Physics

Ammeter and Voltmeter

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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 […]

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Physics

Moving Coil Galvanometer

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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, […]

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Physics

Ampere’s law

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Science > Physics > Magnetic Effect of Electric Current > Ampere’s law In this article, we shall study the Ampere’s law and its application in finding magnetic induction due to long straight conductor, solenoid and toroid. Statement: The line integral of the magnetic field B around any closed path is equal to μ0 times the net […]

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Physical Chemistry

Electrochemical Series and its Applications

Science > Chemistry > Electrochemistry > Electrochemical Series A series of electrodes or half cells arranged in order of their increasing standard oxidation potentials or in the decreasing order of their standard reduction potentials is called an electromotive force series or electrochemical series. Electrochemical series is also known as e.m.f. series Characteristics Electrochemical Series: In […]