Advertisements
Advertisements
प्रश्न
A current of 1.6 mA flows through a conductor. If charge on an electron is –1.6 × 10-19 coulomb, find the number of electrons that will pass each second through the cross section of that conductor.
Advertisements
उत्तर
Current, I = 1.6 mA = 1.6 × 10-3 A
Charge, Q = -1.6 × 10-19 coulomb
t = 1 sec
Charge flowing through the conductor in one second
I = `"Q"/"t"`
Q = I × t
Substituting the values in the formula above we get,
Q = 1.6 × 10-3 × 1
= 1.6 × 10-3
No. of electrons = `(1.6 xx10^-3)/(1.6xx10^-19)`
= `10^16`
Therefore, the number of electrons that will pass each second through the cross section of that conductor = 1016
संबंधित प्रश्न
State two causes of energy loss in a transformer.
The values of current (I) flowing through a given resistor of resistance (R), for the corresponding values of potential difference (V) across the resistor are as given below:
| V (volts) | 0.5 | 1.0 | 1.5 | 2.0 | 2.5 | 3.0 | 4.0 | 5.0 |
| I (amperes) | 0.1 | 0.2 | 0.3 | 0.4 | 0.5 | 0.6 | 0.8 | 1.0 |
Plot a graph between current (I) and potential difference (V) and determine the resistance (R) of the resistor.
How much work is done in moving a charge of 2 C across two points having a potential difference of 12 V?
Name a device which helps to maintain potential difference across a conductor (say, a bulb).
Keeping the potential difference constant, the resistance of a circuit is doubled. The current will become:
If the potential difference between the end of a wire of fixed resistance is doubled, by how much does the electric power increase?
What current will be taken by a 920 W appliance if the supply voltage is 230 V?
A V-I graph for a nichrome wire is given below. What do you infer from this graph? Draw a labelled circuit diagram to obtain such a graph.
A 10 m long wire of a particular material is of reistance 5Ω What will be the resistance of 5m long wire of same material and the same thickness.
Find the potential difference required to flow a current of 300 mA in a wire of resistance 20 Ω.
