Current Electricity and Electrical InstrumentEasy
Question
There are 8.4 × 1022 free electrons per cm3 in copper. The current in the wire is 0.21 A (e = 1.6 × 10-19 C). Then the drifts velocity of electrons in a copper wire of 1 mm2 cross section, will be :-
Options
A.2.12 × 10−5 m/s
B.0.78 × 10−5 m/s
C.1.56 × 10−5 m/s
D.none of these
Topic: Current Electricity and Electrical Instrument·Practice all Current Electricity and Electrical Instrument questions
More Current Electricity and Electrical Instrument Questions
10,000 electrons are passing per minute through a tube of radius 1cm. The resulting current is :...Which of the following wires of the same material will have higher resistance :-...The electro-chemical equivalent of a substance is numerically equal to the mass of the substance deposited if a current ...Three unequal resistors in parallel are equivalent to a resistant 1 ohm. If two of them are in the ratio 1 : 2 and if no...wire of length L is drawn such that its diameter is reduced to half of its original diameter. If the initial resistance ...