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

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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.
Transcribed Image Text: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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