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WorksheetsCurrent electricity- AFL
Total questions: 10
Worksheet time: 4mins
Potential difference between the terminals of a cell in an open circuit is,
potential difference
Terminal potential difference
emf
How does resistivity depend on relaxation time ?
directly
inversely
directly by its 4th power
Which of the following equations is incorrect ?
j =σ E
j = i / A
j= n e Vd
j = e ζ /m
The relation between relaxation time and temperature can be expressed as;
ζ ∝ temperature
ζ ∝ 1/ temperature
ζ is independent of temperature
For a) metals and b) semiconductors, the number of charge carriers
a) remains constant b)increases
a) increases b) increases
a) decreases b) remains constant
a) increases b) increases
The conductivity of a semiconductor ------- rapidly with temperature
increases
decreases
The dimensional formula of current density is
⌈ L-2 A ⌉
⌈ L2 A-1⌉
⌊ L-1 A2 ⌋
Mobility is the ......
ratio of electric field to the drift velocity
product of drift velocity and relaxation tme
ratio of drift velocity to the electric field.
If the current flowing in an iron wire is allowed to flow through another iron wire of double the radius,then what will be the effect on the drift velocity of the electrons ?
would become double
would become ¼
would become ½
no effect
n e Vd = ____ ?
σ
ρ
j
G
