ANSWER ALL OF THE FOLLOWING B. Write the letter that corresponds to your answer 1. The resistance of a conductor is not dependent with_ a. mass b. area c. length d. resistivity 2. When the temperature of wire made from copper is increased, the resistance a. .remains the same b. decreases c. increases d. depends on the temperature involved 3. Which of the following units is not equivalent to watt? a. J/s b. An C. AV d. Q/ 4. .A battery is connected to the external circuit. The potential drop within the battery is directly proportional with a. emf of the battery c. equivalent resistance of circuit . current in circuit d. power distributed in circuit 5. What is the effect on the current in a simple circuit if both voltage and resistance are reduced by half? a. Halved b. stays the same c. doubles d .quadruples In a parallel combination of resistors, the current is varying b. the same c. greater in value d. lesser in value 7. In a series combination of resistors, the voltage drop is a. varying b. the same c. greater in value d. lesser in value 3. When resistors are connected in parallel, what happens to their resistance? a. more than the smallest resistance c. within the values of larges and smallest resistance b. less than the smallest resistance epends on the voltage drop 9. The Kirchhoff's rule on voltage drops is consistent with a. energy conservation . impulse and momentum b. conservation of charge d. angular momentum conservation 10. The magnetic fields come from a. atoms in iron b. permanent magnets c. magnetic domains d. moving charges 1 1. The observer moves past a stationary electron. The instruments he brings could only measure . magnetic field b. electric field c. none of the above d. both electric and magnetic field 2. Magnetic fields could not interact with a. stationary charges b. moving charges c. stationary magnets d. moving magnets 13. The lines could give convenience in visualizing the field. Which of the following is false? a. the path followed by the iron particle corresponds to magnetic field line b. the path followed by an electric charge corresponds to an electric field line c. the compass needle lines up parallel to magnetic field lines d. magnetic field lines do not exist 14. The magnetic field 2 cm from a long, straight wire is 10-6 T. The current in the wire is a. 0.1 A b. 100 A c. 1000 A d. 0.0001 A 15. A 17 uC charge is moving at the speed of light (3 x 108 m/s) in the magnetic field of 4.02 mT. What is the force on the charge? a. 8.59 N b. 290 N c. 8.59 x 10 2 N d. 1.00 x 1016 N 16. A 20 V potential difference is applied in a series combination of a 10 $2 and a 30 $2 resistors. The current in the 10 2 resistor is a. 0.5 A b. 0.3 A C. 0.67 A d. 0.2 A 17. The potential difference across the 10 $2 resistor in No. 16 is a. 5 V b. 10 V c. 15 V d. 20 V 18. An electric heater draws a current of 20 A when connected to a 120 V power source. The resistance is a. 0.17 0 b.6 12 c.8 12 d.2400 0 19. When a 100 W, 240 V light bulb is operated at 200 V, the current flowing is a. .0.35 A b.0.75 A C.0.90 A d.0.10 A B. Essay The severity of a shock depends on the magnitude of the current through your body. Would you prefer to be in series or in parallel with a resistance, such as the heating element of a toaster, if you were shocked by it? Explain