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PHYS102_Quiz2_Soln

# PHYS102_Quiz2_Soln - PHYS-102 SPRING-08 QUIZ-II Time Limit...

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PHYS-102 SPRING-08 QUIZ-II Time Limit: 50 min. ______________________________________________________________________________ Name______________________ Recitation Sec.#_______ Notes : 1 . For problems 2 and 3, your solutions must have adequate details to get full credit. F = q E 1 2 2 kQ Q F r = 1/ 4 πε 0 = 9 2 2 9 10 k x Nm C ! = U = kQ 1 Q 2 /r ; V = kQ/r ; 1/C = 1/C 1 + 1/C 2 +1/C 3 +…. C= Q/V C = C 1 + C 2 +C 3 +…. U = QV/2 ; Δ W field = - Δ U ; E x = - dV/dx ____________________________________________________________________ NOTE: For Prob.1, below, please circle the answer of your choice for each part. 1a .( 3pts .) Suppose at one instant the electrons and the nucleus of a helium atom occupy the positions as shown. The electric potential energy of this charge configuration is: [a] – 3.5kQ 2 /r [b] – 4kQ 2 /r [c] zero [d] + 4kQ 2 /r 1b . ( 3pts. ) Two capacitors are connected in series as shown with C 1 =2C 2 . If U 1 and U 2 are, respectively the potential energy stored in C 1 and C 2 ., which of the following statements is true? [a] U 1 = 2U 2 [b] 2U 1 = U 2 [c] U 1 = U 2 [c] 4U 1 = U 2 1c . ( 3pts. ) When the potential difference between the plates of a capacitor is doubled, the potential energy stored in the capacitor is: [a] doubled [b] halved [c] unchanged [d] quadrupled

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