Let's take a current-carrying cable with a gradually narrowing cross-sectional area along the length of the wire so the wire turns into the shape of a very long, truncated cone. How does the drift speed (vd) vary along the length of the wire?  It speeds up with the length or   vd first increases and then goes down after it reaches to a critical value.or    It slows down with the length of the cable or    vd remains the same regardless the cross section of the cable

Q: For the circuit shown below, E = 26 V, L = 4.8 mH, and R = 4.5 Q. After steady state is reached with…

A: Given  ∈=26 VL = 4.8 mHR = 4.5 Ω

Q: Two very long, parallel wires are separated by d = 0.065 m. The first wire carries a current of I1 =…

A: Given:distance between the wires, d = 0.065 mcurrent in wire 1, I1 = 0.75 Acurrent in wire 2, I2 =…

Q: Consider a long, horizontal Large Wire with current of 10A flowing through it. We want to levitate a…

A: A) As we know that the direction of magnetic field above a current carrying wire in which current…

Q: A portion of a metal wire is shown below. When connected to a battery, an electric field is set-up…

A: electron moves opposite in the direction of applied electric field. When electric field is applied…

Q: In the accompanying figure, the rails, connecting end pieces, and rod all have a resistance per unit…

A:

Q: Two very long, parallel wires are separated by d = 0.015 m. The first wire carries a current of I1 =…

A:

Q: Question #12. Calculate the current in Resistor 3 (R3). (3 pts) V1 10V R3 R1 R2 12 12 R4 122

A:

Q: A coaxial cable consists of a solid center conducting wire and an outer coaxial cylindrical…

A:

Q: A current-carrying ohmic metal wire has a cross-sectional area that gradually becomes smaller from…

A: Drift velocity is the average velocity of charged particles when an external electric field is…

Q: In the accompanying figure, the rails, connecting end pieces, and rod all have a resistance per unit…

A: Here in this question, we will use the concept of motional emf. When a conductor moves in a Magnetic…

Q: Wire A and Wire B are each carrying the same current. If the diameter of Wire A is twice that of…

A: Drift velocity: It is a average velocity attained by a charged particle (electrons, protons) in a…

Q: You know that Wires 1 and 2 are a distance, d = 0.81 m, apart and that they carry the same current,…

A: The distances between wires 1 and 2 is 0.81 m, and that between wires 2 and 3 is 2.43 m Wires 1 and…

Q: In the circuit of the figure & - 1.33 kV, C - 7.30 µF, R1 = R2 - R3 = 0.830 MQ. With C completely…

A:

Q: The figure indicates one reason no one should stand under a tree during a lightning storm. If…

A:

Q: In the circuit of the figure & = 1.70 kV, C = 9.50 µF. R = R2 = R3 = 0.750 MQ. With C completely…

A:

Q: A battery with ? = 6 V and no internal resistance supplies current to the circuit shown in the…

A: a. When the switch is open, then the resistances R1, R2, and R3 are in series connection, so…

Q: In the accompanying figure, the rails, connecting end pieces, and rod all have a resistance per unit…

A: Given: The velocity of the rod(v)= 3.5 m/s Magnetic field perpendicular to the rail(B)= 0.4T…

Q: The figure below is a cross-sectional view of a coaxial cable. The center conductor is surrounded by…

A:

Q: The figure below is a cross-sectional view of a coaxial cable. The center conductor is surrounded by…

A: (a) B = u0*I1/(2pi*a) = (4pi*10^-7*1.14)/(2pi*1*10^-3) = 228*10^-6 T = 228 uT upward

Q: Taking R = 2.30 kN and Ɛ= 490 V in the figure shown below, determine the magnitude and direction of…

A: Let's draw the currents flowing through the circuit .

Q: epresented by the variable j

A:

Q: In the circuit shown, E = 4V, R₁ =43, R₂ = 72 , and C = 14 µF. I₁* Initially, the capacitor is…

A: Voltage of battery (V) = 4V R1= 43 ohm. R2= 72 ohm. C= 14 micro farad.

Q: A portable CD player uses a current of 7.5 mA at a potential difference of 3.5 V. (a) How much…

A: a) The expression for find energy is E=QV=ItV Substitute values in the above equation…

Q: (mC) 60 15 0 1 2 4 5 mA O 10 mA 15 mA 20 mA O 25 mA 3.

A:

Q: The switch in the circuit below has been open for a very long time. If L is 8.04 Henries, the…

A: The current I2 at the moment switch is closed is 0.63 Amperes.

Q: Calculate the current through the resister.  Which way does it go?  (Upward or downward) Please see…

A:

Q: The figure below shows a cross sectional view of 5 wires separated by a distance 0.0147 m. The…

A:

Q: A student wants to know how much current passes through three (3) wires that are made of different…

A:

Q: The figure below is a cross-sectional view of a coaxial cable. The center conductor is surrounded by…

A: here we use the Ampere circuital law         I1 =1.20 Amp out of the page    r1 = d = 10-3 m  I 2…

Electromagnets

The word "electromagnet" is composed of two words, ‘electro’ and ‘magnet’. It is a type of magnet in which an electric current helps in the generation of a magnetic field. Electromagnets usually consist of two major parts, wire and a coil around which the wire is wound. This is called a solenoid. When an electric current is allowed to pass through the coiled wire, the electric current produces a magnetic field. This magnetic field is present only when current is passing through the wire.