Name: _____________________________ Date: ___________ For this experiment, pleas

Question

Name: _____________________________ Date: ___________

For this experiment, please go to this website:

https://phet.colorado.edu/sims/html/faradays-law/latest/faradays-law_en.html

Use only the default single coil/solenoid.

Data

In this experiment, you need to make careful observation of the direction of the deflection on the analog meter. From this, you should deduce the direction of the induced current in the coil, and the direction of the induced magnetic field generated by the coil.

Write down, in your own words, the definition of Lenz’s Law (2 points).

Look carefully at how the analog meter is connected. The meter will produce a positive deflection if the current enters from the positive terminal. It will produce a negative deflection if the current enters the negative terminal. Knowing this, indicate the direction of current flow in the solenoid when viewed from the right. Write your answer in the table below. Your answer should be either clockwise (cw) or counter-clockwise (ccw). (2 points)

Direction of Meter Deflection

Direction of current flow in Solenoid

+

-

Insert the N-pole end of the magnet into the solenoid from the right. Observe the deflection on the meter. (a) In what direction is current flowing in the solenoid? (b) In what direction is the induced magnetic field? Stop moving the magnet once half of it is inside the solenoid. (c) What happens to the deflection when the magnet stops moving? (6-points)

Reverse the motion of the magnet and pull the magnet out of the solenoid. Observe the deflection on the ammeter and compare it to Step #3. (a) In what direction is current flowing in the solenoid? (b) In what direction is the induced magnetic field? Stop moving the magnet once it is out of the solenoid. (c) What happens to the deflection when the magnet stops moving? (6-points)

Now use the S-pole of the magnet. Insert the magnet from the right side of the solenoid once again. Observe the deflection. (a) Compare the direction of the deflection with that of Step #3 when you were using the N-pole end. (b) In which direction is the current flowing in the solenoid? (c) In which direction is the induced magnetic field? (3 points)

Repeat Step #3, but this time, insert the N-pole of the magnet from the left side of the solenoid. Observe the deflection on the meter. (a) In what direction is current flowing in the solenoid? (b) In what direction is the induced magnetic field? (c) How is this different than what you saw in Step #3? (3 points)

Questions

Apply Lenz’s Law and explain the observation in Step #3. (4 points)

Apply Lenz’s Law and explain the observation in Step #4. (4 points)

Direction of Meter Deflection

Direction of current flow in Solenoid

+

-

Explanation / Answer

Lenz's law- An induced electromotive force generates a current that induces a magnetic field such that it opposes the magnetic field generating the current.

Deflection       Direction of current

+                    ccw

-                     cw

North pole moving inside

a)+

b)towars left

c)Deflection becomes zero

North pole moving out

a)-

b)towards right

c)Deflection becomes zero

South pole moving in

a)-

b)cw

c)towards right

North pole moving in from left

a)ccw

b)right

c)Difference in direction of current flow and that of induced magnetic field

In step 3, the flux change induces an emf which in turn induces a current moving ccw when observed from right.This generates a magnetic field to left , with polarity same as north pole and hence repelling the magnet pole entering.

In step 4, the flux change induces an emf which in turn induces a current moving cw when observed from right.This generates a magnetic field to right ,with polarity same as south pole and hence repelling the magnet pole entering.

Related Questions

Navigate

• Browse (All)
• Browse N
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.