- Given the battery combination below (with the compass either above or below the wire section AB), indicate (with a new arrow) the direction that the compass needle will deflect.
a) Points inwardb) Points inward c) Points outward d) Points outward
- Given the current carrying wires shown below, indicate the direction of the magnetic field at each of the lettered points (left, right, up, down, etc).
a)A – right, B – down, C – left, D – up
b)E – left, F – up, G – right, H – down
c)I – right, J – down, K – left, L - up
3. Given each set of two current carrying wires below, describe the net magnetic field at each lettered point. You may assume that the current flow in each wire has the same magnitude.
A – net downD – net up
B – net upE – net field of zero
C – net downF – net down
4. For the current-carrying conductors shown (with their magnetic fields), indicate the direction of CONVENTIAL CURRENT in each wire.
Current flows UP Current flows RIGHTX (into page)dot (out of page)
- Four current-carrying wires are shown below. The direction of the ELECTRON FLOW is shown. Draw the magnetic field lines around each one, including the appropriate “x” and “dot” markings.
- Draw the magnetic field generated around the single loop and around the SOLENOID (coiled wire) below.
a)Arrows down through loop
b)Arrows pointing to the Left
c)Arrows pointing to the Right
d)Arrows pointing to the Right
7. For each electromagnet shown, label the appropriate ends of the nail as North (“N”) and SOUTH (“S”).
a)b)
c)d)
a) Head (North), Tip (South)b) Head (North), Tip (South)
c) Tip (North), Head (South)d) Tip (North), Head (South)
8. Two wires are shown below. One crosses over the top of the other. The directions of the CONVENTIONAL CURRENT in each wire is also shown. Which quadrants (I, II, III, or IV) have “constructive interference” of the fields (ie. the fields add together because they are in the same direction). Which quadrants have “destructive interference” (ie. the fields act against each other because they are in opposite directions). Label the quadrants as “C” or “D” for Constructive or Destructive.
a)b)c)
Q1 - DQ1 - DQ1 - D
Q2 – CQ2 - CQ2 - C
Q3 – DQ3 - DQ3 - D
Q4 – CQ4 - CQ 4 - C
9. For each picture below, draw an arrow (labeled “I”) to depict the direction that the conventional current will flow through the loop of wire when the magnet is moved in the given direction.
a) b)
c)d)
a) CCWb) CWc) CWd) CW
10. Each picture below, a loop of wire is moving through a given magnetic field. Draw an arrow (labeled e-) to depict the direction that the electrons will move through the wire.
a)b)
c)d)
e)f)
a) CCWb) no flowc) no flowd) CCWe) CWf) CW
11. In each picture below, either the magnet OR the coil (with a nail inside) will be moving. Indicate using an arrow labeled “I”, the direction of the induced conventional current that will be caused by the given movement.
a)b)
c) d)
e) f)
a) current flows into Left wireb) current flows into Right wire
c) current flows into Left wired) current flows into Top wire
e) current flows into Right wiref) current flows into Left wire
12. For each question below, find the direction of either 1) the motion of the charged particle, 2) the magnetic field, or 3) the magnetic force OR find the charge of the particle (whichever is unknown).
Charged particle’s sign: / -Motion direction: / East
Dir. of Magnetic Field: / South
Dir. of Magnetic Force / UP
/ Charged particle’s sign: / +
Motion direction: / North
Dir. of Magnetic Field: / down
Dir. of Magnetic Force / West
Charged particle’s sign: / -
Motion direction: / North
Dir. of Magnetic Field: / Upward
Dir. of Magnetic Force / West
/ Charged particle’s sign: / +
Motion direction: / South
Dir. of Magnetic Field: / East
Dir. of Magnetic Force / Upward
Charged particle’s sign: / -
Motion direction: / North
Dir. of Magnetic Field: / South
Dir. of Magnetic Force / No force
/ Charged particle’s sign: / +
Motion direction: / Downward
Dir. of Magnetic Field: / East
Dir. of Magnetic Force / South
Charged particle’s sign: / -
Motion direction: / South
Dir. of Magnetic Field: / Upward
Dir. of Magnetic Force / East
/ Charged particle’s sign: / -
Motion direction: / Up
Dir. of Magnetic Field: / North
Dir. of Magnetic Force / East
13. What is the direction of the force felt by each point shown below (up, down, or none).
14. If the loop is turned in the direction shown, which wire (A or B) will current travel OUT of.