# 2 is the beam curved or straight explain connect the

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Unformatted text preview: electron beam (the room may have to be dark for this to be visible.) 2. Is the beam curved or straight? Explain. • Connect the 6 VDC (Volts Direct Current) power supply and the Fluke meter to the Helmholtz coils as shown in figure 3. Be sure to use the 10 amp connection on the Fluke meter to avoid damaging it! This applies 0 – 1.2 amps DC to the coils, creating the uniform magnetic field as per Eq. 2. You can adjust the current using the black knob on the power supply and read its value on the Fluke meter. 3. Predict: (i) Will the beam radius increase or decrease if you increase the magnetic field? (ii) What if you increase the anode-cathode (B+) voltage? Explain your reasoning for each conceptually, without simply referring to Eq. 1. • Increase the magnetic field. Were your predictions correct? If not, explain the correct reasoning here. Physics 7B Charge-to-mass: e/m p. 8 • Set the voltage and magnetic field so that you see a well-defined circular electron beam path. You will in a moment measure the radius of the path. But first, develop a radius-measuring technique to avoid the parallax error. (Hint: notice the illuminated scale, or the mirror strip and washers attached to the apparatus.) 4. E...
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## This note was uploaded on 11/19/2010 for the course LECTURE 1 taught by Professor Yildiz during the Fall '10 term at University of California, Berkeley.

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