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Electric Current MCQ - Practice Questions with Answers
Edited By admin | Updated on Sep 25, 2023 25:23 PM | #NEET
Quick Facts
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18 Questions around this concept.
Solve by difficulty
Electron current will flow from
In the Bohr model, the electron of a hydrogen atom moves in a circular orbit of radius $5.3 * 10^{-11} \mathrm{~m}$ with a speed of $2.2 * 10^6 \mathrm{~m} / \mathrm{s}$. Determine the current I (in mA ) in the orbit due to rotatory motion of electron
The charge flowing in a conductor varies with time as, . The minimum current in the conductor -
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An infinite number of point charges are placed on a non-conducting ring of radius
. If it rotates with an angular speed
, The equivalent current will be -
The current in a conductor where
is in amperes and
in seconds. The electric charge flowing through a section of the conducting during
is
The charge flowing in a conductor varies with time Then the current -
A current if flows through a wire. Calculate the number of electrons passing through any cross-section of the wire in
seconds.
Concepts Covered - 1
Current
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Definition: Electric current is defined as the rate of flow of electric charge through any cross-section.
i.e If a charge of flows through an area for time
then
-
average electric current through the area is defined as
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The instantaneous current at any time t is given by
And If the flow is uniform then Current
If a current I flows through an area for time t then, total charge flowing is
- The direction of current:-
As Current is the rate of flow of charge, Charge can be +ve or -Ve.
The direction of flow of positive charge is considered as the conventional direction of current .
Or the direction opposite to the direction of flow of negative charge is considered as the conventional direction of the current .
- current flows through a circuit only if the circuit is closed
For a closed circuit
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Conventional current: Positive terminal to negative terminal
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Electron current: Negative terminal to Positive terminal
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Current can be added algebraically.
- Current is a tensor quantity ( if in options tensor is not given take current as scalar quantity)
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Unit of Electric Current: The unit of electric current is Ampere or A.
The current is said to be 1 ampere when 1 coulomb of charge flows through any cross-section in every second.
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Calculating current in different situation-
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When charge is performing translatory motion
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If
particles each having charge
pass a given area in time
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When charge is performing rotatory motion
If a point charge q is moving in a circle of radius r
With Velocity V (frequency , angular speed \omega and time period T)
Then
-
Types of current
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Alternating current
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Magnitude and direction both varies with time.
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Shows heating effect only.
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Its symbol
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Direct current
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No change in magnitude and direction with time.
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Shows heating effect , chemical effect and magnetic effect of current.
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It's a symbol
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Current independent of Area-
Current does not change with change in cross-sectional area
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