4) What is the magnitude of the net electric field at the center of the square?
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1 Fur charges are n the fur crners f a square. Q = +5C, Q = -0C, Q 3 = +5C, Q 4 = -0C. The side length f each side f the square is 3 m. Q Q ) What is the directin f the frce n Q due t ONLY Q 4? (a) up (b) dwn (c) left (d) right (e) zer Q 4 Q 3 ) What is the x-cmpnent (hrizntal cmpnent) f the NET frce n Q due t the ther three charges? (psitive is t the right) (a) 0.05 N (b) 0.04 N (c) 0 N (d) N (e) N 3) What is the y-cmpnent (vertical cmpnent) f the NET frce n Q due t the ther three charges? (psitive is up) (a) 0.05 N (b) 0.04 N (c) 0 N (d) N (e) N 4) What is the magnitude f the net electric field at the center f the square? (a) 40,000 N/C (b) 30,000 N/C (c) 0,000 N/C (d) 0,000 N/C (e) 0 N
2 (The same situatin f the previus page is cntinued here.) Fur charges are n the fur crners f a square. Q = +5C, Q = -0C, Q 3 = +5C, Q 4 = -0C. The side length f each side f the square is 3 m. Q Q 5) What is the electric ptential at the center f the square? (a) 4,400 V (b),00 V (c) 0 V (d) -,00 V (e) -4,400 V Q 4 Q 3 6) What is the ttal electric ptential energy f this system? (a) 0.66 J (b) 0.33 J (c) 0 J (d) J (e) J
3 A capacitr is cnnected t a battery and charged up. It remains cnnected t the battery s that the vltage acrss the capacitr stays fixed. Then the distance between the plates f the capacitr is increased. 7) What happens t the capacitance f the capacitr? (a) increases (b) decreases (c) remains the same 8) What happens t the charge n the capacitr? (a) increases (b) decreases (c) remains the same 9) What happens t the energy stred in the capacitr? (a) increases (b) decreases (c) remains the same 0) What happens t the magnitude f the electric field between the plates f the capacitr? (a) increases (b) decreases (c) remains the same
4 The fllwing circuit has the values: V = 9 V, R =, R =, R 3 = 3, R 4 = 4, R 5 = 5. ) Cmpare the current thrugh R, R 4, and R 5. V (a) I > I 5 > I 4 (b) I > I 5 = I 4 (c) I = I 5 > I 4 (d) I = I 4 = I 5 (e) I > I 4 > I 5 ) Cmpare the vltage drp acrss R, R 3, and R 4. (a) V 4 > V > V 3 (b) V 4 > V = V 3 (c) V 4 > V 3 > V (d) V 4 = V 3 = V (e) V 4 = V 3 > V 3) Calculate the current thrugh R. (a).09 A (b).75 A (c).3 A (d).74 A (e) 3.8 A 4) Calculate the vltage drp acrss R. (a) 0.8 V (b) 0.59 V (c) 0.80 V (d) 0.97 V (e).57 V 5) Calculate the pwer dissipated in R 4. (a) 0.94 W (b).09 W (c). W (d).35 W (e).48 W
5 A square lp with side lengths f 0.4 m is mving tward a lng straight vertical wire with a current f 3.9 A. In the psitin shwn, the frnt edge f the lp is 0.3 m frm the straight wire and the induced current is.6 A in a CCW directin. 6) What is the directin f the magnetic field near the lp due t the lng straight wire? (a) up (b) dwn (c) ut f the page (d) int the page (e) right 7) What is the directin f the current in the lng straight vertical wire? (a) up (b) dwn (c) zer 8) What is the directin f the frce n the lp due t the lng straight vertical wire, as the lp mves tward the lng straight vertical wire? (a) up (b) dwn (c) left (d) right (e) zer 9) What is the magnitude f the frce n the lp due t the lng straight vertical wire, at the instant described abve? (a) 4.3 x 0-7 N (b) 5.7 x 0-7 N (c) 7. x 0-7 N (d) 8. x 0-7 N (e) 9.5 x 0-7 N 0) If the lp were n the ther side f the vertical wire but mving in the same directin (t the right) what wuld be the directin f the induced current? (a) clckwise (b) cunterclckwise (c) there wuld be n induced current the change in magnetic flux wuld be zer!
6 A simple RLC series circuit is cnnected t a generatr with frequency 60 Hz. The maximum vltage acrss each element (the resistr, inductr, and capacitr) is measured alng with the maximum current in the circuit. It is fund that: V Rmax = 8 V, V Lmax = 5 V, V Cmax = 37 V and I max = 0.8 A. ) In which circuit element des the current lag the vltage? (a) capacitr (b) inductr (c) resistr ) What is the maximum vltage acrss the generatr? (a) 3.4 V (b).6 V (c) 38. V (d) 49. V (e) 60.7 V 3) What is the capacitance f the capacitr? (a) 6 F (b) 5 F (c) 3 F (d) 57 F (e) 65 F 4) What is the inductance f the inductr? (a) 83 mh (b) 5 mh (c) 7 mh (d) mh (e) 65 mh 5) What is the average pwer dissipated in the circuit? (a) 4.3 W (b) 7. W (c) 0. W (d) 6.5 W (e) 0. W 6) What is the resnance frequency f this RLC circuit? (a) Hz (b) 38 Hz (c) 60 Hz (d) 73 Hz (e) 9 Hz
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