Question

1. When charged particles move parallel to the direction of a magnetic field, then according to the magnetic force equation, the particles will travel in a

a. straight line b. circular path c. helical path d. loop

2. A 3.0-m length of wire is stretched horizontally between two vertical posts. The wire carries a current of 54.9 A and experiences a magnetic force of 20.6 N. If the magnetic field has a strength of 0.25 T at the location of the wire, at what angle is the magnetic field with respect to the wire?

a. 25 degrees b. 30 degrees c. 35 degrees d. 40 degrees e. 45 degrees

3. A proton moving to the right enters a magnetic field. If the proton is pushed upward, then the magnetic field must be

a. upward b. downward c. into the page d. out of the page

4. If an electron moves through the same magnetic field as in the previous question, what will happen to the electron?

a. it will be pushed upward with an equal force b. it will be pushed upward with a different force because of the different mass c. it will be pushed downward with an equal force d. it will be pushed downward with a different force because of the different mass

5. A coil rests in the plane of the page while a magnetic field is directed into the page. A counter-clockwise current is induced

a. when the magnetic field gets stronger b. when the size of the coil decreases c. when the coil is moved sideways across the page through the constant magnetic field d. when the magnetic field is tilted so it is no longer perpendicular to the page

6. A single loop of wire with a radius of 3.0 cm is flat on a table, while the earth's magnetic field(5.0*10^-5 T) is passing through at an angle of 70 degrees(20degrees above the table). What is the magnetic flux through the loop?

a. 1.54*10^-6 Wb b. 1.54*10^-8 Wb c. 4.84*10^-6 Wb d. 4.84*10^-8 Wb

7. Suppose you are looking at two current loops in the plane of the page. When the switch S is closed, a clockwise current begins. What is the direction of the induced current in the right loop when the left loop turns on?

a. clockwise b. counter-clockwise c. into the page d. out of the page

8. Recall the electrical power is equal on both sides of a transformer. This being said, if a step-up transformer doubles the voltage, what will happen to the current in the secondary coil?

a. it will double the current in the primary coil b. it will be equal to the current in the primary coil c. it will be half of the current in the primary coil d. it will cause the transformer to blow from too much power e. not enough information

Answer 1