Use the Following Figure for the Next Problem $\theta$ = 25 ^$\circ$

question 87

Multiple Choice

Use the following figure for the next problem.
-The electrons coming out of the electron gun in an electron microscope are being accelerated by a potential of 100 kV.The electrons then pass through a region of magnetic field of distance y = 8 cm which points perpendicularly to the direction of travel of the electron.What is the strength of the magnetic field needed to deflect the electron by an angle of $\theta$ = 25 ^$\circ$ ? (Ignore any relativistic effect.1 Gauss = 10^-4 T)

• A)120.1 Gauss
• B)30.4 Gauss
• C)21.8 Gauss
• D)14.6 Gauss
• E)None of these is correct.

---

Definitions:

Variable-Ratio

A schedule of reinforcement where a response is reinforced after an unpredictable number of responses, often used in behaviorist conditioning.

Vending Machine

A machine that dispenses small articles such as snacks, beverages, alcohol, cigarettes, or lottery tickets to customers automatically, after the customer inserts currency or credit.

Coin

A piece of metal issued by governmental authority as money.

Discriminative Stimulus

A signal in the environment that increases the likelihood of a particular response because it indicates that a specific reinforcement is available.