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Figure 29-25 represents a snapshot of the velocity vectors of four electrons near a wire carrying current i. The four velocities have the same magnitude; velocity is directed into the page. Electrons 1 and 2 are at the same distance from the wire, as are electrons 3 and 4. Rank the electrons according to the magnitudes of the magnetic forces on them due to current i, greatest first.

Short Answer

Expert verified

The ranking of electrons according to the magnitude of the magnetic forces on them due to current i isF1>F3=F4>F2.

Step by step solution

01

Step 1: Given

Figure representing a snapshot of the velocity vectors of four electrons near a wire carrying currenti is given.

|v1|=|v2|=|v3|=|v4|=v

02

Determining the concept

Find the magnetic field on each electron using the formula for the magnetic field at a perpendicular distance from the wire. From this, find the magnetic forces acting on each electron. Comparing them, findthe ranking of electrons according to the magnitude of the magnetic forces on them due to current i.

Right Hand Rule states that if we arrange our thumb, forefinger, and middle finger of the right-hand perpendicular to each other, then the thumb points towards the direction of the motion of the conductor relative to the magnetic field, and the forefinger points towards the direction of the magnetic field and the middle finger points towards the direction of the induced current.

Formulae are as follow:

B=μ0i2πR

role="math" localid="1663331285544" F=qvBsinϕ

Where, B is magnetic field, R is radius, iis current,𝛍is permeability,F is magnetic force, v is velocity, q is charge of particle.

03

Determining the rank of electrons according to the magnitude of the magnetic forces on them due to current i, greatest first

Magnetic field at a distance R from a wire carrying current i is given by,

B=μ0i2πR

Let electron 1 and 2 be at distance r and electron 3 and 4 be at distance R from the wire. Then, the magnetic fields experienced by the given electrons are,

B1=μ0i2πr,B2=μ0i2πr,B3=μ0i2πR,B4=μ0i2πR

Since, R > r,

B3=B4<B1=B2

From right hand rule, interpret that magnetic field is directing into the page.

The magnetic force on electron is given by,

F=evBsinϕ

From right hand rule, interpret that magnetic field on each electron is directed into the page.

Hence, the magnetic forces on the given electrons are,

F1=evB1sin90°=evμ0i2πr, F2=evB2sin180°=0, F3=evB3sin90°=evμ0i2πR

F4=evB4sin90°=evμ0i2πR

Hence, the ranking of electrons according to the magnitude of the magnetic forces on them due to currenti is,

F1>F3=F4>F2

Therefore, magnetic force on the particle due to currenti in the wire depends on the magnetic field, its distance from the wire, and the angle between its velocity and applied magnetic field.

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Most popular questions from this chapter

Figure 29-62 shows, in cross section, two long straight wires held against a plastic cylinder of radius20.0cm. Wire 1 carries currentrole="math" localid="1663151041166" i1=60.0mAout of the page and is fixed in place at the left side of the cylinder. Wire 2 carries currenti2=40.0mAout of the page and can be moved around the cylinder. At what (positive) angleθ2should wire 2 be positioned such that, at the origin, the net magnetic field due to the two currents has magnitude80.0nT?

A solenoid 1.30 long and2.60cm in diameter carries a current of 1.80A. The magnetic field inside the solenoid is 23.0mT . Find the length of the wire forming the solenoid.

Figure 29-26 shows four arrangements in which long parallel wires carry equal currents directly into or out of the page at the corners of identical squares. Rank the arrangements according to the magnitude of the net magnetic field at the center of the square, greatest first.

Question: In Figure, current I=56.2mAis set up in a loop having two radial lengths and two semicircles of radiia=5.72cm andb=9.36cm with a common centerP(a) What are the magnitude and (b) What are the direction (into or out of the page) of the magnetic field at P and the (c) What is the magnitude of the loop’s magnetic dipole moment? and (d) What is the direction of the loop’s magnetic dipole moment?

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