The positive charge +q enters from the left with a speed v. The magnetic field B and electric field E are directed as shown. Neglect gravity. B a. What is the direction of the magnetic force on the positive charge (in/out/left/right/top/bottom/zero)? b. What is the direction of the electric force on the positive charge (in/out/left/right/top/bottom/ c. In what direction will the charge be deflected if it is moving very fast? Hint: only one of the for speed of the charge. Think about which force will dominate when the charge is moving very fas

The positive charge +q enters from the left with a speed v. The magnetic field B and electric field E are directed as shown. Neglect gravity. B a. What is the direction of the magnetic force on the positive charge (in/out/left/right/top/bottom/zero)? b. What is the direction of the electric force on the positive charge (in/out/left/right/top/bottom/ c. In what direction will the charge be deflected if it is moving very fast? Hint: only one of the for speed of the charge. Think about which force will dominate when the charge is moving very fas

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Concept explainers

Relativistic Energy and Momentum

According to classical physics, time flow is the same for every observer. But according to einstein's theory, time flow is different for different observers. The idea that time flow is not the same for all may sound strange because we may not experience this effect in everyday life. This effect is only observed when an object moves with some velocity comparable to the velocity of light. This velocity is termed relativistic velocity.

Question

Physics 212 - Module 5 Hands On Activities Packet
Activity 5.9 Velocity Selector and Mass Spectrometer
After this activity you should know: Be able to do problems which have both magnetic and electric fields.
Understand how cross electric and magnetic fields are used in a velocity selector. Understand how a mass spectrometer
works.
A velocity selector is a device that only lets charges with a particular
velocity through.
1. The positive charge +q enters from the left with a speed v. The
magnetic field B and electric field E are directed as shown.
Neglect gravity.
Student Add Name Here
f.
v
B
d. In what direction will the charge be deflected if it is moving very slowly?
E
a. What is the direction of the magnetic force on the positive
charge (in/out/left/right/top/bottom/zero)?
b. What is the direction of the electric force on the positive charge (in/out/left/right/top/bottom/zero)?
c. In what direction will the charge be deflected if it is moving very fast? Hint: only one of the forces depend on teh
speed of the charge. Think about which force will dominate when the charge is moving very fast.
e. There is only one speed where the charges will not be deflected. Find this speed in terms of E, B and/or q.
Show work. Neglect gravity.
Which answers (a thru e) changes if the charge was negative instead of positive. Which answers do not
change?
g. Now assume the electric field is directed into the page, opposite the direction of B. Will the velocity selector
still work?
J.J. Thomson used cross electric and magnetic fields in his discovery of the electron in 1897. He showed that the
charges in the a cathode ray tube consisted of particles with a very low mass to charge ratio by measuring their
deflection in an electric field.

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