A teacher has a great fear of electrons, and wants to create a potential difference across the walls of the lab (which are 15 cm thick) that’s capable of completely stopping any electron traveling toward the lab at any speed 6.0 Mm/s or slower. How large should this potential difference be and should the larger side be on the inside or outside of the wall?

The vertical deflecting plates of a typical classroom oscilloscope are a pair of parallel square metal plates carrying equal but opposite charges. The potential difference between the plates is 25.0 V. Typical dimensions are about 3.3 cm on a side, with a separation of about 5.0 mm. The plates are close enough that we can ignore fringing at the ends. Part A: Under these conditions, how much charge is on each plate?(Express your answer in coulombs.) Part B: How strong is the electric field between the plates?(Express your answer in volts per meter.) Part C:If an electron is ejected at rest from the negative plates, how fast is it moving when it reaches the positive plate?(Express your answer in meters per second.)

A battery of C V is connected across capacitors of capacitances C1 = C6 = 11 μF, C3 = C4 =C5 = 62 μF, C2 =62/2 μF. i. What is the equivalent capacitance Ceq of the capacitors, youshould show your work by simplifying your circuit part by part bysaying which ones are serially and parallelly connected? ii. Calculate the charge Q stored in the circuit? iii. Calculate the total energy stored in the capacitor?

Three capacitors are connected as shown, where C = 0.035 F.  Part A) What is the equivalent capacitance, in farads, between points A and B?  Part B)If the capacitors are charged with a ΔV = 10 V source, how much energy will the circuit store, in joules?