Advertisements
Advertisements
Question
In a conductor 6.25 × `10^16` electrons flow from its end A to B in 2 s. Find the current flowing through the conductor (e = 1.6 × `10^-19` C)
Solution
Number of electrons flowing through the conductor,
N = `6.25 × 10^16` electrons
Time taken, t = 2 s
Given, e = `1.6 × 10^-19` C
Let I be the current flowing through the conductor.
Then, I = `"ne"/t`
∴ I = `((6.25 xx 10^16)(1.6 xx10^-19))/2`
= ` 5 xx 10^-3`A
Or, I = 5 mA
Thus, 5 mA current flows from B to A.
APPEARS IN
RELATED QUESTIONS
Ohm's law gives a relationship between:
(a) current and resistance
(b) resistance and potential difference
(c) potential difference and electric charge
(d) current and potential difference
The unit of electrical resistance is:
(a) ampere
(b) volt
(c) coulomb
(d) ohm
An electric bulb draws 1.2 A current at 6.0 V. Find the resistance of filament of bulb while glowing.
Choose the correct alternative.
Which of the following is an ohmic conductor?
Write a short note on superconductors?
Two cells each of 5V are connected in series across an 8Ω resistor and three parallel resistors of 4Ω, 6Ω, and 12Ω. Draw a circuit diagram for the above arrangement. Calculate
- the current drawn from the cell
- current through each resistor
A student carries out an experiment and plots the V-I graph of three samples of nichrome wire with resistances R1, R2 and R3 respectively. Which of the following is hue?
A student carries out an experiment and plots the V-I graph of three samples of nichrome wire with resistances R1, R2 and R3 respectively. Which of the following is true?
Two conductors are made of the same material and have the same length. Conductor A is a solid wire of diameter 1 mm. Conductor B is a hollow tube of outer diameter 2 mm and inner diameter 1 mm. Find the ratio of resistance RA to RB.
Suppose there is a circuit consisting of only resistances and batteries and we have to double (or increase it to n-times) all voltages and all resistances. Show that currents are unaltered. Do this for circuit of Example 3.7 in the NCERT Text Book for Class XII.
