Current Electricity

Related Questions

• $A\,\,{5^o}C$ rise in the temperature is observed in a conductor by passing some current. When the current is doubled, then rise in temperature will be equal to

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• The resistivity of iron is $1 \times {10^{ - 7}}\,ohm - m$. The resistance of a iron wire of particular length and thickness is 1 ohm. If the length and the diameter of wire both are doubled, then the resistivity in $ohm - m$ will be

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• By increasing the temperature, the specific resistance of a conductor and a semiconductor

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• A wire when connected to 220V mains supply has power dissipation ${P_1}$. Now the wire is cut into two equal pieces which are connected in parallel to the same supply. Power dissipation in this case is ${P_2}$. Then ${P_2}:{P_1}$ is

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• If an electron revolves in the path of a circle of radius of $0.5 \times 10^{–10}m$ at frequency of $5 \times 10^{15}$ cycles/s the electric current in the circle is (Charge of an electron = $1.6 \times 10^{–19} C$ )

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