A proton (+1.6 times 10^-19 C) moves 10 cm on a path in the direction of a unifo

Question

A proton (+1.6 times 10^-19 C) moves 10 cm on a path in the direction of a uniform electric field of strength 3.0 N/C. How much work is done on the proton by the electrical field? 4.8 times 10^-20 J -4.8 times 10^-20 J 1.6 times 10^-20 J -1.6 times 10^-20 J zero Two point charges of values +3.4 and +6.6 mu C are separated by 0.10 m. What is the electrical potential at the point midway between the two point charges? +1.8 times 10^6 V -1.8 times l0^6 V -0.90 times 10^6 V +0.90 times 10^6 V +3.6 times 10^6 V Number 10 copper wire (radius =1.3 mm) is commonly used for electrical installations in homes. What is the voltage drop in a total of 40 m of # 10 copper wire if it carries a current of 10 A? 1.3 V 0.77 V 0.50 V 0.13 V 7.7 V Resistors of values 8.0 ohm, 12.0 ohm are connected in series across a battery with a small internal resistance. Which resistor dissipates the greatest power the 8.0-ohm resistor the 12.0-ohm resistor the 24.0-ohm resistor the answer depends on the internal resistance of the battery. all the resistors dissipate same amount of power. Two resistors of values 6.0 and 12.0 ohm are connected in parallel. This combination in turns is hooked in series with a 4.0-ohm resistor. What is the overall resistance of this combination? 0.50 ohm 2.0 ohm 8.0 ohm 22.0 ohm 14.0 ohm A hair dryer draws 1200 W, a curling iron draws 800 W, and an electric light fixture draws 500 W. If all three of these appliances are operating in parallel on a 120-V circuit, what is the total current drawn? 19.4 A 20.8 A 25.4 A 36.7 A 28.2 A

Explanation / Answer

23) a) 4.8*10^-20 J

Workdone by electric field = F*d

= q*E*d

= 1.6*10^-19*3*0.1

= 4.8*10^-20 J

24) a) +1.8*10^6 volts

Vnet = k*q1/d + k*q2/d

= 9*10^9*3.4*10^-6/0.05 + 9*10^9*6.6*10^-6/0.05

= 1.8*10^6 volts

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