Practice Problems - Test 2
1.Apply Kirchhoff's rules to find the current in the circuit shown
2.A/an ________ must be inserted INTO the circuit while a/an ________ can be attached to the
circuit.(a)voltmeter, ammeter (b)voltmeter, ohmmeter (c)ammeter, voltmeter (d)voltmeter, galvanometer
3.What is the current through the 36 Ohm resistor shown in the circuit? 
(a)0.25A (b)0.33A (c)0.10A (d)0.17A
4.An electric power line carries a current of 1400A in a location where the earth's magnetic field is 0.50x10-4 T.
The line makes an angle of 75 degrees with respect to the field. Determine the magnitude of the magnetic force on a 120m length of line (8.1 N)
5.A solenoid is 0.50m long, has three layers of windings of 750 turns each, and carries a current of 4.0A. What is the magnetic field at the center of the solenoid? (2.3x10-2 T)
6.An electron moving with velocity v to the right enters a region of uniform magnetic field that points into the paper. After the electron enters this region it will be
(a)deflected out of the paper (b)deflected upward (c)deflected into the plane of the paper
(d)deflected downward
7.A horizontal wire carries a current directly away from you. From your view point, the magnetic field produced
from this current (a)points directly away from you (b)circles the wire in clockwise direction (c)points directly
towards you (d)circles the wire in the counterclockwise direction
8.Two long parallel wires are placed side-by-side on a horizontal, frictionless table. If the wires carry currents in
the opposite directions (a)wires would move towards one another (b)wires would move away from one another (c)wires would be lifted off the table (d)nothing at all would happen
9.A 2m long straight wire carrying a current of 5A is placed perpendicular to a magnetic field of B= 0.1 T. The magnetic field of the force on the wire is (a) 0 (b) 0.1 N (c) 1 N (d) 10 N
10.The magnetic field 2m away from a long straight wire carrying a current of 2A is (a) 1 T (b) 4 T
(c) 4x10-7 T (d) 2x10-7 T
11.A solenoid of 10000 turns/m carries a current of 1000A. The magnetic field at the center of the solenoid is (a) 1x107 T (b) 4x107 T (c) 4.5x10-7 T (d) 4 Pi T
12.A 1.0m long conducting rod is moving perpendicular to a 0.35T magnetic field. How fast must the rod move in order to produce an emf of 12V across its ends? (34m/s)
13.A 1.0m long rod is moving at a constant speed of 21m/s perpendicular to a 0.15T magnetic field. The rod is
connected to an 5.0 Ohms external resistor. How much force is required to keep the rod moving at constant speed? (a) 6.4 N (b) 0.38 N (c) 8.0 N (d) 0.094 N
14.A 1:150 transformer has a primary voltage of 4500V.
(a)What is the voltage in the secondary coil?
(b)If the transformer consumes 45W, what are the currents in the primary and the secondary coils?
15.Answer the questions below
(a)The average velocity of the carriers in a conductor is called the _____
(b)The property of a conductor that causes it to produce heat when a potential difference is applied across it is its _____
(c)A device in which non electrical energy is converted into electric energy is called a source of _____
(d)The ratio of the potential difference across a conductor to the current passing through it is its _____
(e)The unit of resistivity is the _____
(f)Current density is measured in SI units of _____
(g)The rate at which the heat is dissipated in a resistor is measured in SI units of _____
(h)A device that transforms chemical energy into electrical energy is called a _____
(i)A material in which current can flow without resistance is called a _____
 
bhatti@panam.edu
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