Question

1. A 10-volt voltage source is connected in a series arrangement with two resistors (R1 = 7 ohms, R2 = 3 ohms). The current flowing in each resistor is:

a) 1.8 amperes   b) 45 amperes   c) 0.05 amperes   d) 1 ampere    e) 3.5 amperes

2. What is the voltage across R2 in the above circuit?

a) 2 volts   b) 10 volts   c) 3 volts   d)   0.25 volts   e)   5 volts

       3. If R1 and R2 are now connected in parallel, what is their effective resistance?

a) 2.1 ohms    b) 10 ohms   c) 14.8 ohms   d) 0.04 ohms    e) 4 ohms

. A 10 volt battery is connected to a RC DISCHARGE circuit made up of an unknown capacitor that is connected in parallel with a 1,000 ohm resistor. If the half life of this circuit is 10 seconds, what is the value of the unknown capacitor?

a) 0.0144 F   b) 12.28 F    c)   16.2 F   d)   0.025 F   e) 693 F

5. How long will it take this circuit to discharge from 10 volts to 1.25 volts?

a)   22 s    b) 69 s    c)   100 s    d) 30 s    e) 125 s

6. A wire carrying 10 amperes of current is oriented at 90 degrees with respect to a magnetic field of 5 Tesla. How long must the wire be to generate a force of 5 Newtons?

a) 0.1 meters   b) 15 meters   c) 2 meters   d) 7.07 meters    d) 0.005 meters

Answer 1

the answers are,

1) (d) 1 ampere.

2) (c) 3 volt

3) (a) 2.1 ohm.

4) (a) 0.0144 F

5) (d) 30 s.

6) (a) 0.1 m.