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

An electret is similar to a magnet, but rather than being permanently magnetized, it has a permanent electric dipole moment. Suppose a small electret with electric dipole moment 1.0×10-7Cm is 25cmfrom a small ball charged to +25nC, with the ball on the axis of the electric dipole. What is the magnitude of the electric force on the ball?

Short Answer

Expert verified

The electric force on the ball is9.216×10-3N.

Step by step solution

01

Given information

Given the electric dipole of charge 25nCwith a dipole moment of 10-7Cmseparated b distance25cm.

02

Explanation

Electric field due to a dipole:

E=2p4πε0r3E=9×109×2×1×10-7253×10-6E=1.152×105N/C

The electric force on the ball:

E=FqF=EqF=1.152×105N/C1.0×10-7CmF=9.216×10-3N

The electric force on the ball is9.216×10-3N

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

A positron is an elementary particle identical to an electron except that its charge is +e. An electron and a positron can rotate about their center of mass as if they were a dumbbell connected by a massless rod. What is the orbital frequency for an electron and a positron1.0nm apart?

An electric dipole is formed from ±1.0nCcharges spaced apart. The dipole is at the 2.0mmorigin, oriented along the x-axis. What is the electric field strength at the points (a) (x,y)=(10cm,0cm)and(b)(x,y)=(0cm,10cm)?

The surface charge density on an infinite charged plane is -2.0×10-6C/m2 . A proton is shot straight away from the plane at 2.0×106m/s. How far does the proton travel before reaching its turning point?

FIGUREP23.41 is a cross section of two infinite lines of charge that extend out of the page. Both have linear charge density λ. Find an expression for the electric field strength E at height y above the midpoint between the lines.

A problem of practical interest is to make a beam of electrons turn a 90°corner. This can be done with the parallel-plate capacitor shown in FIGURE. An electron with kinetic energy 3.0×10-17Jenters through a small hole in the bottom plate of the capacitor.

a. Should the bottom plate be charged positive or negative relative to the top plate if you want the electron to turn to the right? Explain.

b. What strength electric field is needed if the electron is to emerge from an exit hole 1.0cmaway from the entrance hole, traveling at right angles to its original direction?

Hint: The difficulty of this problem depends on how you choose your coordinate system.

c. What minimum separation dminmust the capacitor plates have?

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