Advertisements
Advertisements
प्रश्न
A copper wire of 10-6 m2 area of cross-section, carries a current of 2 A. If the number of electrons per cubic meter is 8 × 1028, calculate the current density and average drift velocity.
Advertisements
उत्तर
A = 10-6 m2, I = 2A, n = 8 × 1028
Formula:
Current density, J = J = `"I"/"A"`
Drift velocity, `"V"_"d" = "J"/"ne"`
J = `"I"/"A" = 2/10^-6 = 2 xx 10^6`
J = `2xx10^6 "Am"^-2`
`"V"_"d" = "J"/"ne" = (2 xx 10^6)/(8 xx 10^28 xx 1.6 xx 10^-6)`
`"V"_"d" = = 0.1562 xx 10^-3`
`"V"_"d" = 15.6 xx 10^-5 "ms"^-1`
APPEARS IN
संबंधित प्रश्न
Use Kirchhoff's rules to obtain conditions for the balance condition in a Wheatstone bridge.
Given the resistances of 1 Ω, 2 Ω, 3 Ω, how will be combine them to get an equivalent resistance of (11/5) Ω?
Given the resistances of 1 Ω, 2 Ω, 3 Ω, how will be combine them to get an equivalent resistance of (6/11) Ω?
In the given circuit, assuming point A to be at zero potential, use Kirchhoff’s rules to determine the potential at point B.
Find the circuit in the three resistors shown in the figure.
An infinite ladder is constructed with 1 Ω and 2 Ω resistors, as shown in the figure. (a) Find the effective resistance between the points A and B. (b) Find the current that passes through the 2 Ω resistor nearest to the battery.
State the principle of potentiometer.
Three resistors having resistances r1, r2 and r3 are connected as shown in the given circuit. The ratio `"i"_3/"i"_1` of currents in terms of resistances used in the circuit is :
The value of current in the 6Ω resistance is ______.
A constant voltage of 50 V is maintained between the points A and B of the circuit shown in the figure. The current through the branch CD of the circuit is:
