Exam 3 Calculation problems Name 1 The current through a 10 ohm resistor connected to a 120 V power supply is A 12 A B 120 A C 10 A D 1 A E none of these 1 2 A 10 ohm resistor has a 5 A current in it What is the voltage across the resistor A 15 V B 5 V C 10 V D 20 V E more than 20 V 2 3 When a 10 V battery is connected to a resistor the current in the resistor is 2 A What is the resistor s value A 5 ohms B 2 ohms C 20 ohms D 10 ohms E more than 20 ohms 3 4 A 4 ohm resistor is connected in parallel with a 6 ohm resistor This combination produces an equivalent resistance of A 5 5 ohms B 2 4 ohms C 4 ohms D 5 ohms E 10 ohms 4 5 The current through two identical light bulbs connected in series is 0 25 A The voltage across both bulbs is 110 V The resistance of a single light bulb is A 22 ohms B 440 ohms C 220 ohms D 44 ohms E none of these 5 6 A 6 0 C negative charge is attracted to a large well anchored positive charge How much kinetic energy does the negatively charged object gain if the potential difference through which it moves is 3 mV A 0 50 J B 18 nJ C 6 0 J D 0 50 kJ 6 1 7 An electron was accelerated from rest through a potential difference of 9900 V What is its speed A 4 9 107 m s B 5 9 107 m s 7 8 A wire has a current of 6 0 mA in it How many electrons pass a given point in a minute A 6 3 1014 B 360 C 5 4 10 15 D 2 3 1018 8 9 A proton with speed 1 5 105 m s falls through a potential difference of 100 volts gaining speed What is the speed reached A 2 04 105 m s 9 C 3 9 107 m s D 2 9 107 m s B 4 56 105 m s C 8 80 105 m s D 3 55 105 m s E 1 55 106 m s 10 A 100 0 pF capacitor consists of two circular plates of radius 0 40 mm How far apart are the plates The value of o is 8 85 10 12 C2 N m 2 10 11 A 1 0 F capacitor has a potential difference of 6 0 V applied across its plates If the potential difference across its plates is increased to 8 0 V how much additional energy does the capacitor store A 2 0 J B 28 J C 4 0 J D 14 J 11 12 A battery does 10 0 J of work moving 4 0 C of charge between its terminals What is the emf of the battery A 40 V B 2 5 V C 0 63 V D 160 V 12 A 0 0025 m B 0 0050 m C 0 044 m D 0 022 m 2 13 Each of the resistors in the circuit shown have a resistance of 160 0 resistance of the circuit What is the equivalent 13 A 160 0 B 640 0 C 480 0 D 400 0 14 The resistors in the circuit shown each have a resistance of 600 of the circuit What is the equivalent resistance 14 A 600 B 1200 C 150 D 2400 15 A 10 0 V battery is connected across two resistors in series If the resistors have resistances of 840 0 and 590 0 what is the voltage drop across the 590 0 resistor A 7 0 V B 14 V C 5 9 V D 4 1 V 15 16 A very long wire generates a magnetic field of 0 0050 10 4 T at a distance of 3 0 mm What is the magnitude of the current A 3300 mA B 7 5 mA C 24 000 mA D 1 7 mA 16 17 A wire carrying a current is shaped in the form of a circular loop of radius 4 0 mm If the magnetic field strength at its center is 1 1 mT with no external magnetic fields contributing to it what is the magnitude of the current that flows through the wire A 28 A B 17 A C 14 A D 7 0 A 17 3
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