1) A parallel plate capacitor has constant electric field and potential differen

Question

1) A parallel plate capacitor has constant electric field and potential difference of 18.0V between the plates separated by a distance of 9.20mm.
(a) What is the electric field between the plates?
(b) If an electron is placed next to the negatively charged plate and released, what is the speed of the electron when it reaches the other plate?

2.1) A household microwave has a power consumption of 750W. If the current through the microwave is 5.00A,
(a) What is the resistance of the microwave?
(b) if it takes 5.0x105J of energy to cook 100g of rice, how long, in min, should you keep the rice in the microwave?

Explanation / Answer

(a) Electric field,

E = V/d = 18/9.2*10^-3 =1956 N/C

(b) U = F*d

=q*E*d

= e E d = (1/2) mv^2

1.6*10^-19*1956 *9.2*10^-3 =(1/2)*9.11*10^-31*v^2

v =2.51* 10^6 m/s

(2)

(a) P = 750 w, I =5 A

P = I^2 /R

R = 750/25 = 30 Ohms

(b) Time taken,

t = W/P = .5*10^5 /750

=66.67 seconds.

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