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PHYS 104-106 Engineering Physics - II Homework-3 (upto 10 points bonus directly to the Final Exam) Q1) 15. Given the circuit shown in Fig. 26-34, use the words "increases," "decreases," or "stays the same" to complete the following statements: (a) If R7 increases, the potential difference between A and E ___. Assume no resistance in (A) and E. (b) If R7 increases, the potential difference between A and E _. Assume (A) and E have resistance. (c) If R7 increases, the voltage drop across R4 _. (d) If R2 decreases, the current through R1 _. (e) If R2 decreases, the current through R6 _. (f) If R2 decreases, the current through R3 _. (g) If R5 increases, the voltage drop across R2 _. (h) If R5 increases, the voltage drop across R4 _. (i) If R2, R5, and R7 increase, E (r = 0) ___. FIGURE 26-34 Question 15. R2, R5, and R7 are variable resistors (you can change their resistance), given the symbol -VVV-. Q2) 26-3 Kirchhoff's Rules 27. (I) Calculate the current in the circuit of Fig. 26-45, and show that the sum of all the voltage changes around the circuit is zero. Q3) 51. (III) Two resistors and two uncharged capacitors are arranged as shown in Fig. 26-62. Then a potential difference of 24 V is applied across the combination as shown. (a) What is the potential at point a with switch S open? (Let V = 0 at the negative terminal of the source.) (b) What is the potential at point b with the switch open? (c) When the switch is closed, what is the final potential of point b? (d) How much charge flows through the switch S after it is closed? Q4) 83. A flashlight bulb rated at 2.0 W and 3.0 V is operated by a 9.0-V battery. To light the bulb at its rated voltage and power, a resistor R is connected in series as shown in Fig. 26-72. What value should the resistor have? Q5) 5. (II) The force on a wire is a maximum of 7.50 x 10^-2 N when placed between the pole faces of a magnet. The current flows horizontally to the right and the magnetic field is vertical. The wire is observed to "jump" toward the observer when the current is turned on. (a) What type of magnetic pole is the top pole face? (b) If the pole faces have a diameter of 10.0 cm, estimate the current in the wire if the field is 0.220 T. (c) If the wire is tipped so that it makes an angle of 10.0" with the horizontal, what force will it now feel? Q6) 17. (I) Determine the direction of B for each case in Fig. 27-43, where F represents the maximum magnetic force on a positively charged particle moving with

          PHYS 104-106 Engineering Physics - II
Homework-3 (upto 10 points bonus directly to the Final Exam)
Q1)
15. Given the circuit shown in Fig. 26-34, use the words "increases," "decreases," or "stays the same" to complete the following statements:
(a) If R7 increases, the potential difference between A and E _____. Assume no resistance in (A) and E.
(b) If R7 increases, the potential difference between A and E _____. Assume (A) and E have resistance.
(c) If R7 increases, the voltage drop across R4 _____.
(d) If R2 decreases, the current through R1 _____.
(e) If R2 decreases, the current through R6 _____.
(f) If R2 decreases, the current through R3 _____.
(g) If R5 increases, the voltage drop across R2 _____.
(h) If R5 increases, the voltage drop across R4 _____.
(i) If R2, R5, and R7 increase, E (r = 0) _____.
FIGURE 26-34
Question 15. R2, R5, and R7 are variable resistors (you can change their resistance), given the symbol -VVV-.
Q2)
26-3 Kirchhoff's Rules
27. (I) Calculate the current in the circuit of Fig. 26-45, and show that the sum of all the voltage changes around the circuit is zero.
Q3)
51. (III) Two resistors and two uncharged capacitors are arranged as shown in Fig. 26-62. Then a potential difference of 24 V is applied across the combination as shown. (a) What is the potential at point a with switch S open? (Let V = 0 at the negative terminal of the source.) (b) What is the potential at point b with the switch open? (c) When the switch is closed, what is the final potential of point b? (d) How much charge flows through the switch S after it is closed?
Q4)
83. A flashlight bulb rated at 2.0 W and 3.0 V is operated by a 9.0-V battery. To light the bulb at its rated voltage and power, a resistor R is connected in series as shown in Fig. 26-72. What value should the resistor have?
Q5)
5. (II) The force on a wire is a maximum of 7.50 x 10^-2 N when placed between the pole faces of a magnet. The current flows horizontally to the right and the magnetic field is vertical. The wire is observed to "jump" toward the observer when the current is turned on. (a) What type of magnetic pole is the top pole face? (b) If the pole faces have a diameter of 10.0 cm, estimate the current in the wire if the field is 0.220 T. (c) If the wire is tipped so that it makes an angle of 10.0" with the horizontal, what force will it now feel?
Q6)
17. (I) Determine the direction of B for each case in Fig. 27-43, where F represents the maximum magnetic force on a positively charged particle moving with

PHYS 104-106 Engineering Physics - II
Homework-3 (upto 10 points bonus directly to the Final Exam)
Q1)
15. Given the circuit shown in Fig. 26-34, use the words "increases," "decreases," or "stays the same" to complete the following statements:
(a) If R7 increases, the potential difference between A and E . Assume no resistance in (A) and E.
(b) If R7 increases, the potential difference between A and E . Assume (A) and E have resistance.
(c) If R7 increases, the voltage drop across R4 .
(d) If R2 decreases, the current through R1 .
(e) If R2 decreases, the current through R6 .
(f) If R2 decreases, the current through R3 .
(g) If R5 increases, the voltage drop across R2 .
(h) If R5 increases, the voltage drop across R4 .
(i) If R2, R5, and R7 increase, E (r = 0) .
FIGURE 26-34
Question 15. R2, R5, and R7 are variable resistors (you can change their resistance), given the symbol -VVV-.
Q2)
26-3 Kirchhoff's Rules
27. (I) Calculate the current in the circuit of Fig. 26-45, and show that the sum of all the voltage changes around the circuit is zero.
Q3)
51. (III) Two resistors and two uncharged capacitors are arranged as shown in Fig. 26-62. Then a potential difference of 24 V is applied across the combination as shown. (a) What is the potential at point a with switch S open? (Let V = 0 at the negative terminal of the source.) (b) What is the potential at point b with the switch open? (c) When the switch is closed, what is the final potential of point b? (d) How much charge flows through the switch S after it is closed?
Q4)
83. A flashlight bulb rated at 2.0 W and 3.0 V is operated by a 9.0-V battery. To light the bulb at its rated voltage and power, a resistor R is connected in series as shown in Fig. 26-72. What value should the resistor have?
Q5)
5. (II) The force on a wire is a maximum of 7.50 x 10^-2 N when placed between the pole faces of a magnet. The current flows horizontally to the right and the magnetic field is vertical. The wire is observed to "jump" toward the observer when the current is turned on. (a) What type of magnetic pole is the top pole face? (b) If the pole faces have a diameter of 10.0 cm, estimate the current in the wire if the field is 0.220 T. (c) If the wire is tipped so that it makes an angle of 10.0" with the horizontal, what force will it now feel?
Q6)
17. (I) Determine the direction of B for each case in Fig. 27-43, where F represents the maximum magnetic force on a positively charged particle moving with

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