Advertisements
Advertisements
प्रश्न
A current of 100 mA. flows through a wire. The charge on an electron is 1.6 × 10-19 C. Find the number of electrons passing per second through the cross-section of the conductor.
Advertisements
उत्तर
Given: I = 100mA = 100 × 10-3 A = 0.1A, e = 1.6 × 10-19 C
Let n electrons are passing per second. Charge on one electron = e
Total charge passed in one second = ne
Thus, i = ne or
n = `"i"/"e" = 0.1/(1.6 xx 10^-19) = 6.25 xx 10^17`.
संबंधित प्रश्न
Define one coulomb charge.
A potential difference of 20 volts is applied across the ends of a resistance of 5 ohms. What current will flow in the resistance?
What p.d. is needed to send a current of 6 A through an electrical appliance having a resistance of 40 Ω?
Explain the analogy between the flow of charge (or current) in a conductor under a potential difference with the free fall of a body under gravity.
The following table shows current in Amperes and potential difference in Volts.
Which law will the graph prove? Explain the law.
Five resistors of different resistances are connected together as shown in the figure. A 12 V battery is connected to the arrangement.
Calculate:
(i) the total resistance in the circuit
(ii) the total current flowing in the circuit.
A 10 m long wire of a particular material is of resistance 5Ω What will be the resistance if the wire is doubled itself.
A boy records that 4000 joules of work are required to transfer 10 coulombs of charge between two points of a resistor of 50 Ω. The current passing through it is:
Name a device that helps to maintain a potential difference across conductors.
