Current Electricity

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Current Electricity - 02

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Q1. The current density (number of free electrons per m^3) in metallic conductor is of the order of *

1 point

10^28

10^24

10^22

10^26

Q2. A current passes through a resistor. If K1 and K2 represent the average kinetic energy of the conduction electrons and the metal ions respectively then *

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K1 = K2

Any of them may occur

K1 > K2

K1 < K2

Q3. A metal wire is subjected to a constant potential difference. When the temperature of the metal wire increases, the drift velocity of the electron in it *

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decreases, thermal velocity of the electron increases

increases, thermal velocity of the electron increases

decreases, thermal velocity of the electron decreases

increases, thermal velocity of the electron decreases

Q4. The electric field intensity E, current density J and specific resistance k are related to each other through the relation *

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E = J/k

E = J k

E = k/J

k = J E

Q5. The relaxation time in conductors *

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decreases with the increases of temperature

all of sudden changes at 400 K

increases with the increases of temperature

it does not depends on temperature

Q6. In conductor when electrons move between two collisons, their paths are ... A... when external fields are absent and... B...when external filed is present. Here, A and B refer to *

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straight lines, straight lines

curved lines, straight lines

straight lines, curved lines

curved lines, curved lines

Q7. *

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