In electromagnetic waves electric and magnetic fields oscillate in mutually perpendiculor directions as well as perpendicular to the direction of propagation if e.m. wave. Class 12 Physics Chapter 8 Electromagnetic Waves Session 2024-2025.
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NCERT Solutions for Class 12 Physics updated for CBSE academic session 2021-2022.
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Frequency of electromagnetic waves = Frequency of oscillating charge = v. Class 12 Physics Chapter 8 Electromagnetic Waves Session 2024-2025.
Electromagnetic Waves are coupled time-varying electric and magnetic fields propagating in space with the speed of light. Class 12 Physics Chapter 8 Electromagnetic Waves Session 2024-2025.
Large-scale transmission of electric energy over long distances is achieved using transformers. Step-up transformers at power plants increase voltage, reducing current to minimize transmission losses. High-voltage electricity travels through transmission lines efficiently. At distribution points, step-down transformers lower the voltage ...
The transformer works on the principle of electromagnetic induction (Faraday’s law of induction). When an alternating current flows through the primary winding, it creates a changing magnetic flux in the transformer core. This flux induces a voltage in the secondary ...
Here are four common energy losses in a transformer: (i) Core Loss (Iron Loss): This occurs in the transformer core due to hysteresis and eddy currents when it is subjected to alternating magnetic fields. (ii) Copper Loss (Winding Resistance ...
A step up transformer does not violate the law of conservation of energy. Although it enhancesthe output voltage but correspondingly reduces, the circuit current so that power output of even an ideal transformer is same as the power input. Class ...
We know that a capacitor does not allow of direct current through it because the gap between the two plates of capacitor offers an infinite resistance. when an alternating voltage is applied across a capacitor, the capacitor plates are alternately ...
Use of a.c. voltage is preferred over d.c. voltage on account of the following reasons: (i) An a.c generator is easy to operate and maintain. So we prefer to use a.c. voltage. (ii) Using a Transformer voltage of a.c supply ...
A material suitablefor making core of a transformer should have (i) a narrow hysteresis curve so as to minimise energy dissipation during each magnetisation cycle and (ii) a high resistivity to lower eddy current losses. Class 12 Physics Chapter 7 ...