How many electrons per second pass through a section of wire carrying a current of 0.7 A?
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A potential difference is applied across the filament of a bulb at t =0, and it is maintained at a constant value while the filament gets heated to its equilibrium temperautre. We find that the final current in the filament is one sixth of the current drawn at t = 0. if the temperature of the filament at t = 0 is 20∘C and the temperature coefficient of resistivity at 20∘C is 0.0043∘ /C, find the final temperature of the filament.
10
Nov
A potential difference is applied across the filament of a bulb at t =0, and it is maintained at a constant value while the filament gets heated to its equilibrium temperautre. We find that the final current in the filament is one sixth of the current drawn at t = 0. if the temperature of [...]
A typical copper wire might have 2 × 10^21 free electrons in 1 cm of its length. Suppose that the dirft speed of the electrons along the wire is 0.05 cm/s. How many electrons would pass through a given cross section of the wire each second. How large would a current be flowing in the wire?
10
Nov
A typical copper wire might have 2 × 10^21 free electrons in 1 cm of its length. Suppose that the dirft speed of the electrons along the wire is 0.05 cm/s. How many electrons would pass through a given cross section of the wire each second. How large would a current be flowing in the [...]
A beam contains 2.0 × 10^8 doubly charged positive ions per cubic centimeter, all of which are moving toward north with a speed of 1.0×10^5 m/s. (a) what are the magnitude and direction of the current density J→? (b) can you calculate the total current i in this ion beam? If not what additional informaiton in needed.
10
Nov
A beam contains 2.0 × 10^8 doubly charged positive ions per cubic centimeter, all of which are moving toward north with a speed of 1.0×10^5 m/s. (a) what are the magnitude and direction of the current density J→? (b) can you calculate the total current i in this ion beam? If not what additional informaiton [...]
What is the drift speed of the conduction electrons in a coopper wire with radius r 900 um when it has a uniform current I = 17mA? Assume that each copper atom contributes one conduction electron to the current and the current density is uniform across the wire’s cross section.
10
Nov
What is the drift speed of the conduction electrons in a coopper wire with radius r 900 um when it has a uniform current I = 17mA? Assume that each copper atom contributes one conduction electron to the current and the current density is uniform across the wire’s cross section. How many electrons per second [...]
It is desired to make a 20 Ω coil of wire, which has a zero thermal coefficient of resistance. To do this, a carbon resitor fo resistane R1 is placed in series with an iron resistor of resistance R2 the proportions of iron and carbon are so chosen that R1+R2=20Ω for all temperatures near 20∘C. How long are R1 and R2? αcarbon =− 0.5 × 10^−3.∘ C−1 , α iron = 5×10^−3.∘C(−1)
10
Nov
It is desired to make a 20 Ω coil of wire, which has a zero thermal coefficient of resistance. To do this, a carbon resitor fo resistane R1 is placed in series with an iron resistor of resistance R2 the proportions of iron and carbon are so chosen that R1+R2=20Ω for all temperatures near 20∘C. [...]
A conducting sphere of radius r is surrounded by a poorly conducting material of inner radius a and oueter radius b whose resistivity rho varies with rho = rho0r^3. Find teh resistance between the sphere and the outer surface of surrounding conducting material.
10
Nov
A conducting sphere of radius r is surrounded by a poorly conducting material of inner radius a and oueter radius b whose resistivity rho varies with rho = rho0r^3. Find teh resistance between the sphere and the outer surface of surrounding conducting material. How many electrons per second pass through a section of wire carrying [...]
A uniform copper wire of mass 2.23 × 10^−3 kg carries a current of 1 A when 1.7 V is applied across it. Calculate its length and area of cross-section. If the wire is uniformly stretched to double its length, calculate the new resistance. Density of copper is 8.92 × 10^3 kg/m^3 and resistivity is 1.7 × 10^−8 Ω m
10
Nov
A uniform copper wire of mass 2.23 × 10^−3 kg carries a current of 1 A when 1.7 V is applied across it. Calculate its length and area of cross-section. If the wire is uniformly stretched to double its length, calculate the new resistance. Density of copper is 8.92 × 10^3 kg/m^3 and resistivity is [...]
The space between the plates of a parallel plate capacitor is compeletely filled with a materuial of resistivity 2 x 10^11 ohm m and dielectric constant with the given dielectric medium between th eplates is 20 nF. Find the leakage current if a potential difference 2500 V is applied across the capacitor.
10
Nov
The space between the plates of a parallel plate capacitor is compeletely filled with a materuial of resistivity 2 x 10^11 ohm m and dielectric constant with the given dielectric medium between th eplates is 20 nF. Find the leakage current if a potential difference 2500 V is applied across the capacitor. How many electrons [...]
The current density across a cylindrical conductor of radius R varies in magnitude according to the equation J = J0 ( 1−r/R ) where r is the distance from the central axis. Thus, the current density is a maximum J0 at that axis (r = 0) and decreases linearly to zero at the surface (r = R). Calculate the current in terms of J0 and the conductor ‘s cross – sectional area A = πR2.
10
Nov
The current density across a cylindrical conductor of radius R varies in magnitude according to the equation J = J0 ( 1−r/R ) where r is the distance from the central axis. Thus, the current density is a maximum J0 at that axis (r = 0) and decreases linearly to zero at the surface (r [...]
Figure shwos a conductor of length l having a circular cross section . The radius of cross section varies linearly from a to b . The resistivity of the material is rho. Assuming that b-a << l . find the resistance of the conductor.
10
Nov
Figure shwos a conductor of length l having a circular cross section . The radius of cross section varies linearly from a to b . The resistivity of the material is rho. Assuming that b-a << l . find the resistance of the conductor. How many electrons per second pass through a section of wire [...]