Question 1 :
$20\ \mu A$ current flows for $30$ seconds in a wire, transfer of charge will be
Question 3 :
In a conductor $4$ coulombs of charge flows for $2$ seconds. The value of electric current will be
Question 5 :
A material that lets electricity to pass through it is called a/an:
Question 6 :
Electric heaters used for cooking have the filament or the heating coil on a plate made up of clay because
Question 7 :
A steady current is flowing in a cylindrical conductor.Then which one of the following statements is true ?
Question 9 :
In a metallic conductor, electric current is thought to be due to the movement of:
Question 11 :
A material that does not allow electricity to flow through it is called a/an:
Question 13 :
Which of the following does not belong to the group formed by the others?
Question 14 :
Which one of the following substances has infinitely high electrical resistance?
Question 16 :
A steady current flows in a metallic conductor of non-uniform cross-section. Which of the following quantities is constant along the conductor?
Question 19 :
A conductor carries a current of $50\ \mu\ A$. If the area of cross-section of the conductor is $50\ mm^2$, then value of the current density in $Am^{-2}$ is
Question 21 :
Assuming that the charges of an electron is $1.6\times 10^{-19}coulombs$, the number of electrons passing through a section of wire per sec, when the wire carries a current of one ampere is:
Question 22 :
A copper wire with a cross-section area of $2\times 10^{-6}m^2$ has a free electon density equal to $5\times 10^{22}/cm^2$. If this wire carries a current of $16A$, the drift velocity of the electron is?
Question 23 :
Find the drift velocity in Cu wire if it has 1A current through 2 mm cross-section. Free electron density is $8.5\times 10^{22}$ cm$^{-3}$<br/>
Question 24 :
A current $I$ flows through a uniform wire of diameter $d$ when the mean electron drift velocity is $v$. The same current will flow through a wire of diameter $\dfrac{d}{2}$ made of the same material if the mean drift velocity of the electron is
Question 26 :
In a conductor, $6.25\, \times\, 10^{16}$ electrons flow from its end A to B in 2 s. Which is the current flowing through conductor? $(e\, =\, 1.6\, \times\, 10^{-19}\, C)$
Question 27 :
A current of $5 A$ flows through a conductor. Calculate the number of electrons flowing through the conductor in $2s.$ [Take charge of electron as $1.6 \times10^{-19}$
Question 28 :
Conventionally, the direction of the current is taken as the direction of flow<br/><p></p>
Question 29 :
When starter motor of a car is switched on for $0.8 s, 24 C$ of charge passes through the coil of the motor. The current (A) in the coil is
Question 30 :
The current through a conductor is 1 ampere. The no. of electrons that pass through the conductor in one second is:
Question 31 :
In an electric circuit containing a battery, the charge (assumed positive) inside the battery
Question 32 :
If $20$ coulomb charge is flowing in $0.5$ second from a point in an electric circuit when the value of electric current in amperes will be<br/>
Question 33 :
When ${10}^{19}$ electrons are removed from a neutral metal plate through some process, the charge on it becomes _________
Question 35 :
A current of $4.8\  A$ is flowing in a conductor. The number of electrons passing per second through the conductor will be :
Question 36 :
If a charge of $1.6 \times 10^{-19}$ C flows per second through any cross-section of any conductor, the current will be:<br/>
Question 38 :
A current of 5 A is passing through a metallic wire of cross-sectional area $\displaystyle 4\times { 10 }^{ -6 }{ m }^{ 2 }$. If the density of charge carriers of the wire is $\displaystyle 5\times { 10 }^{ 26 }{ m }^{ -3 }$, then the drift velocity of the electrons will be
Question 39 :
Inside a cell in a closed circuit the conventional electric current:
Question 40 :
Current is flowing through a wire of non-uniform<br/>cross section. Cross section of wire A is less<br/>than the cross section of wire at B.<br/><table class="wysiwyg-table"><tbody><tr><td>Table 1</td><td>Table 2</td></tr><tr><td>(a) current at A</td><td>(p) is zero</td></tr><tr><td>(b) drift velocity of<br/>electrons at A</td><td> (q) is more than at B</td></tr><tr><td>(c) electric field in the<br/>wire at A</td><td>(r) is less than at B</td></tr><tr><td>(d) current density at A</td><td>(s) is equal to that at B</td></tr></tbody></table>