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pt41 Phy 102 2010

# pt41 Phy 102 2010 - Physics 102 FORM 0[l Two point charges...

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Physics 102 FORM 0 [l] Two point charges of +60.0 [J,C and —12.0 //C are separated by a distance of 40.0 cm. A + 7.00 /xC charge is placed midway between these two charges. What is the electric force acting on this charge because of the other two charges? [A] Zero. [B] 1.13 N directed towards the negative charge. [C] 1.13 N directed towards the positive charge. [D] 113 N directed towards the positive charge. fl!3 N directed towards the negative charge. [2] Gaussian surfaces A and B enclose the same positive charge +Q. The area of Gaussian surface A is three times larger than that of Gaussian surface B. The flux of electric field through Gaussian surface A is [A] nine times larger than the flux of electric field through Gaussian surface B. [B three times larger than the flux of electric field through Gaussian surface B. I equal to the flux of electric field through Gaussian surface B. [Dj three times smaller than the flux of electric field [E] unrelated to the flux of electric field through Gaussian surface B. [3] An electron, initially at rest is accelerated through a potential difference of 1.80 kV. What is the speed of the electron due to this potential difference? [A] 2.88 x 10 6 m/s [B] 3.18 x 10 6 m/s [C] 6.00 x 10 6 m/s ([Djhs.l x 10 6 m/s [E] 37.4 x 10 6 m/s [4] A parallel plate capacitor has a potential difference of 40 V between the plates. If the charge on the plate of the capacitor is +8 /iC, what is the energy stored in this capacitor? [A] 8 x 10~ 5 J (|B) 16 x 10~ 5 J [C] 32 x 10~ 5 J [D] 64 x 10~ 5 J [E] 128 x 1Q- S J [5] A circular coil of copper wire is lying flat on a horizontal table. A bar magnet is held with its south pole downward, vertically above the center of the coil. The magnet is released from rest and falls toward the coil. As viewed from above, you can say that, as it falls, the magnet induces ([A]/clockwise current in the loop. [B] counterclockwise current in the loop. [C] no current in the loop. [D] an emf but no electric current in the loop. [E] Not enough information is provided. [6] A 1.5-H inductor is connected in series with a 200-fZ resistor through a 15-V dc power supply and a switch. If the switch is closed at t = 0 s, what is the maximum energy stored by the inductor?

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