Relation between Charge and Current

Q.

A conductor carries a current of 0.2 A. How many electrons will flow in 30 seconds if the charge on one electron is $1.6\times {10}^{-19}C$.

1. $2\times {10}^{19}$

2. $3\times {10}^{19}$

3. $3.75\times {10}^{19}$

4. $2.75\times {10}^{19}$

Q.

A charge 0.5 C passes through a cross section of a conductor in 5 seconds. Find the current flowing through the conductor.

1. 0.1 A

2. 0.2 A

3. 0.3 A

4. 0.4 A

Q.

A TV set picture tube shoots out $6.25\times {10}^{16}$ electrons in one second, then find the current flowing in the TV.
(Charge of an electron is $e=1.6\times {10}^{-19}C)$

1. 30 mA

2. 20 mA

3. 10 mA

4. 40 mA

Q.

The potential difference applied to an X-ray tube is 5 kV and the current flowing through it is 3.2 mA. Then what is the number of electrons striking the target per second? [The charge of one electron is $e=-1.6\times {10}^{-19}C$]

1. $5\times {10}^{16}$
2. $1\times {10}^{16}$
3. $4\times {10}^{16}$
4. $2\times {10}^{16}$

Q.

The charge on an electron is known to be $1.6\times {10}^{-19}$ C. In a circuit the current flowing is 1 A. How many electrons will be flowing through the circuit per second?

1. 1.6 x 10¹⁹

2. 0.625 x 10¹⁹

3. 0.625 x 10¹²

4. 1.6 x 10^-19

Q. Match the following quantities with their units.

1. A
2. V
3. W
4. $\Omega$

Q. Every point in a/an has an electric potential.

1. space
2. magnetic field
3. electric field

Q. The difference in electric potential between two points of a conductor is called voltage.

1. True
2. False