A hemispherical network of radius a is made by using a conducting wire of resistance per unit length 'r'. The equivalent resistance across OP is.
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Q3
A galvanometer of resistance 25Ω is connected to a battery of 2V along with a resistance in series. When the value of this resistance is 3000Ω a full scale deflection of 30 units is obtained in the galvanometer. In order to reduce this deflection to 20 units, the resistance in series will be:
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Q4
A galvanometer of resistance 25 ohm is connevted to a battery of 2V along with a resistance in series. When the value of this resistance is 3000 ohm a full scale deflection of 30 units is obtained in the galvanometer. In order to reduce this deflection to 20 units, the resistance in series will be?
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Q5
Name the unit of (a) electrical resistance (b) resistivity