A proton initially moves left to right long the x axis at a speed of 9.0 103 m/s. It moves into an electric field, which points in the negative x direction, and travels a distance of 0.8 m before coming to rest. If the proton's mass and charge are 1.67 1027 kg and 1.60 1019 C respectively, what is the magnitude of the electric field?
a. 4.3E+1 N/C
b. 5.3E2 N/C
c. 5.3E1 N/C
d. 6.6E1 N/C
e. 1.1E+0 N/C
[Ques. 2] An AC power generator produces 27 A (rms) at 4730 V. The energy is transmitted through a long-distance power line, which has a total resistance of 173 . What percentage of the power delivered by the generator is dissipated as heat in the long-distance line if a step-up transformer is not used?
a. 1
b. 20
c. 31
d. 99
e. 98
[Ques. 3] A proton initially moves left to right along the x axis at a speed of 7.0 103 m/s. It moves into an electric field, which points in the negative x direction, and travels a distance of 0.70 m before coming to rest. What acceleration magnitude does the proton experience?
a. 7.0E+3 m/s2
b. 3.5E+7 m/s2
c. 1.8E+9 m/s2
d. 1.4E+12 m/s2
e. 2.5E+9 m/s2
[Ques. 4] A transformer is to be designed to increase the 27-kV (rms) output of a generator to the transmission line voltage of 346 kV (rms). If the primary winding has 95 turns, how many turns must the secondary have?
a. 7
b. 15600
c. 1217
d. 26
e. 4358
[Ques. 5] The average distance of the electron from the proton in the hydrogen atom is 0.65 1010 m. What is the electric field from the proton's charge at the location of the electron? (ke = 8.99 109 N/m2/C2, e = 1.6 1019 C)
a. 3.4E+11 N/C
b. 5.4E+6 N/C
c. 5.2E+1 N/C
d. 2.2E8 N/C
e. 1.0E8 N/C
[Ques. 6] An AC power generator produces 42.9 A (rms) at 2 970 V. The voltage is stepped up to 6 000 V by an ideal transformer, and the energy transmitted through a long-distance power line with a total resistance of 100 . What is the rms current in the long-distance line?
a. 87 A
b. 21.2 A
c. 42.9 A
d. 30.2 A
e. 61.0 A
[Ques. 7] An electron with a charge value of 1.6 1019 C is moving in the presence of an electric field of 400 N/C. What force does the electron experience?
a. 8.0E21 N
b. 6.4E22 N
c. 6.4E17 N
d. 4.0E+17 N
e. 1.6E17 N
[Ques. 8] A transformer consists of a 780-turn primary coil and a 1 403-turn secondary coil. If the current in the secondary is 3.49 A, what is the primary current?
a. 1.94 A
b. 4.68 A
c. 6.28 A
d. 3.49 A
e. 2.60 A
[Ques. 9] Two point charges are separated by 12.0 cm and have charges of +5.0 C and 5.0 C, respectively. What is the electric field at a point midway between the two charges? (ke = 8.99 109 Nm2/C2)
a. 3.7 106 N/C
b. 2.5 107 N/C
c. 3.1 106 N/C
d. 2.1 108 N/C
e. zero
[Ques. 10] Which of the following combinations of circuit components can be used to make a tuner for a radio, to select the desired frequency?
a. fixed inductor, variable resistor
b. fixed resistor, variable inductor
c. fixed inductor, variable capacitor
d. fixed capacitor, variable resistor
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