Warning: foreach() argument must be of type array|object, bool given in /var/www/html/web/app/themes/studypress-core-theme/template-parts/header/mobile-offcanvas.php on line 20

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.

Unlock Step-by-Step Solutions & Ace Your Exams!

  • Full Textbook Solutions

    Get detailed explanations and key concepts

  • Unlimited Al creation

    Al flashcards, explanations, exams and more...

  • Ads-free access

    To over 500 millions flashcards

  • Money-back guarantee

    We refund you if you fail your exam.

Over 30 million students worldwide already upgrade their learning with Vaia!

One App. One Place for Learning.

All the tools & learning materials you need for study success - in one app.

Get started for free

Most popular questions from this chapter

Figure 29-50ashows, in cross section, two long, parallel wires carrying current and separated by distance L. The ratio i1/i2 of their currents is4.00; the directions of the currents are not indicated. Figure 29-50bshows the ycomponent Byof their net magnetic field along the xaxis to the right of wire 2. The vertical scale is set by Bys=4.0nT , and the horizontal scale is set by xs=20.0cm . (a) At what value of x0 is Bymaximum?(b) If i2=3mA, what is the value of that maximum? What is the direction (into or out of the page) of (c) i1 and (d) i2?

One long wire lies along an xaxis and carries a current of30A in the positive xdirection. A second long wire is perpendicular to the xyplane, passes through the point 0,4.0m,0, and carries a current of 40A in the positive zdirection. What is the magnitude of the resulting magnetic field at the point0,2.0m,0?

In Fig. 29-83, two infinitely long wires carry equal currents i. Each follows a 90°arc on the circumference of the same circle of radius R. Show that the magnetic field Bat the center of the circle is the same as the field Ba distance R below an infinite straight wire carrying a current Ito the left.

The current-carrying wire loop in Fig. 29-60a lies all in one plane and consists of a semicircle of radius 10.0cm, a smaller semicircle with the same center, and two radial lengths. The smaller semicircle is rotated out of that plane by angleθ, until it is perpendicular to the plane (Fig.29-60b). Figure 29-60c gives the magnitude of the net magnetic field at the center of curvature versus angleθ . The vertical scale is set byBa=10.0μTandBb=12.0μT. What is the radius of the smaller semicircle?

In Fig 29-59, length a is4.7cm(short) and current iis13A. (a) What is the magnitude (into or out of the page) of the magnetic field at point P? (b) What is the direction (into or out of the page) of the magnetic field at point P?

See all solutions

Recommended explanations on Physics Textbooks

View all explanations

What do you think about this solution?

We value your feedback to improve our textbook solutions.

Study anywhere. Anytime. Across all devices.

Sign-up for free