Oscilloscopes are found in most science laboratories. Inside, they contain defle

Question

Oscilloscopes are found in most science laboratories. Inside, they contain deflecting plates consisting of more-or-less square parallel metal sheets, typically about 2.50cm on each side and 2.50mm apart. In many experiments, the maximum potential across these plates is about 30.0V .

Part A

For this maximum potential, what is the strength of the electric field between the plates?

Part B

For this maximum potential, what magnitude of acceleration would this field produce on an electron midway between the plates?

Explanation / Answer

a)

Electric field strength

E=V/d =30/(2.5*10^-3)

E=12000 N/C or 12 KN/C

b)

acceleration

ma=qE

=>a=qE/m =(1.6*10^-19)(12000)/(9.11*10^-31)

a=2.11*10^15 m/s^2

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