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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.
A circuit contains of a 10 volt battery connected in series with a 4 ohm resistor and a 6 ohm resistor. Why is it complete nonsense to say that 4 volts goes through the 4 ohm resis
Explain the working of a refrigerator A refrigerator is the reverse of a heat engine. Here the working substance extracts heat Q2 from the cold reservoir at temperature T2, som
One way to keep the contents of a garage from becoming too cold on a night when severe subfreezing temperature is forecast is to put a tub of watering the garage. Assume the mass o
Positive charge on n-side of the junction Some of the free electrons move across the junction from n-type to p-type, leaving behind positive donor ions as they
Question: A positively-charged particle is travelling southward in a downward-directed uniform magnetic field. The magnetic force is the merely force if any acting on the parti
Principles of radiation therapy: The basic principle of radiation therapy is to maximize damage to the tumor while minimizing damage to the normal tissue.Factors that determin
If a force applied on a body causes a alteration in the normal positions of the molecules of the body, resulting in a alteration in the configuration of the object either in length
a ball is thrown up and come in the hands of thrower find heigth
These capacitors are made using vitreous enamel on mixture of silica, alkali oxides and fluorides as dielectrics. These capacitors are formed by spraying vitreous lacquer on metal
Q. Why the centre of Newton's rings pattern appears dark? The thickness of the air film becomes zero at the point of contact of lens L with glass plate P. Therefore there is no
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