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Q. What are secondary cells? Give an example?
i) They are rechargeable.
ii) The chemical reactions which take place in secondary cells are reversible.
iii) The active materials which are used up when the cell delivers current can be reproduced by passing current through the cell in opposite direction. Instance lead acid accumulator and alkali accumulator.
What is meant by tunnelling phenomenon? A tunnel diode is a high conductivity two-terminal P-N junction doped heavily about 1,000 times higher than a conventional junction diod
Battery powered vehicles Used DC series motors are the first choice. Recently AC motors with frequency changers are being considered.
Hello, what is isobaric gas?
A toroid having a square cross-section, 5.48cm on the side, and an inner radius of 19.4cm 450 turns and carries a current of 1.04A. (It is made up of a square solenoid instead of r
According to Reynolds, the critical velocity (vc) of a liquid flowing by a long narrow tube is (a) Directly linked to the coefficient of viscosity of the liquid. (b) Inversel
What is a capacitor and measure capacitance of (i) of a plane plate capacitor (ii) of a cylindrical capacitor (iii) of a spherical capacitor
Q. Define Fermi energy. Write down the expression for Fermi Dirac distribution law. Deduce an expression for Fermi energy of a system of free particles. Sol. The Fermi Energy
Explain thew laws of physics It is thought that the laws of physics do not change from place to place. This is why experiments carried out in different countries by dissimilar
Carbon: Atomic number 6 Symbol C Atomic weight 12.011 Discovery Carbon exists fre
Q. What are electromagnetic waves? As-per to Maxwell a speed up charge is a source of electromagnetic radiation. In an electromagnetic wave electric as well as magnetic field
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