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Electricity and Electric Current
Electricity and Electric Current
7 Mins
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QUICK SUMMARY WITH STORIES
Introduction to Electricity
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Electric current and electric charge
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Important Questions
A long straight wire of radius a carries a steady current
$I.$
The current is uniformly distributed over its cross-section. The ratio o the magnetic fields
$B$
and
$B_{′},$
at radial distances
$2a $
and
$2a$
respectively, from the axis of the wire is
Medium
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>
A current of 1 A is drawn by a filament of an electric bulb. Number of electrons passing through a cross section of the filament in 16 seconds would be roughly:
Medium
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>
Calculate the number of electrons constitute one coulomb of charge.
Hard
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>
If the charge on an electron is
$1.6×10_{−19}$
coulombs , how many electrons should pass through a conductor in
$1$
second to constitute
$1$
ampere current ?
Medium
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>
Charge on an electron is
$1.6×10_{−19}$
coulomb. Number of electrons passing through the wire per second on flowing of 1 ampere current through the wire will be
Medium
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>
A current flowing through a wire depends on time as
$I=3t_{2}+2t+5$
. The charge flowing through the cross section of the wire in time from
$t=0$
to
$t=2sec$
is
Medium
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>
A spherical conducting shell of inner radius r1 and outer radius r2 has a charge Q. A charge q is placed at the centre of the cell.
(a) What is the surface charge density on the (i) inner surface (ii) outer surface of the shell.
(b) Write the expression for electric field at a point x r2 from the centre of the shell.
Medium
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>
The current in a conductor varies with time t as
$I=2t+3t_{2}$
amp. where I is ampere and t in second. Electric charge flowing through a section of the conductor during
$t=2sec$
to
$t=3sec$
is:-
Medium
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A current of
$4.8A$
is flowing in a conductor. The number of electrons passing per second through the conductor will be :
Medium
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>
A current of
$5A$
flows through a conductor. Calculate the number of electrons flowing through the conductor in
$2s.$
[Take charge of electron as
$1.6×10_{−19}$
Medium
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>