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Investigate ways of inducing a current in a coiled conductor and ways of affecting the size of the induced current.

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Introduction

INDUCING CURRENT in a COILED CONDUCTOR.

Experiment Number 1 (15-06-04)                                                Name: Suzanne Poulgrain            

AIM:

To investigate ways of inducing a current in a coiled conductor and ways of affecting the size of the induced current

APPARATUS / MATERIALS:

  • Galvanometer
  • 2 solenoids (different number of turns)
  • iron core
  • bar magnet
  • 2 electrical leads

PROCEDURE:

  1. The experiment was set up as seen in Diagram 1.
  2. The N pole of the magnet was:
  1. plunged into the solenoid
  2. held stationary within the solenoid
  3. moved circularly inside the solenoid
  4. quickly removed from the solenoid.
  1. The magnet was then held stationary and the solenoid moved
  1. up
  2. left
  1. The iron core was then placed within the solenoid and the magnet:
  1. plunged into the solonoid
  2. withdrawn from the solenoid.
  1. The magnet was plunged into the solenoid at a:
  1. slow speed
  2. medium speed
  3. rapid speed.
  1. Two magnets were plunged into the solenoid with constant speed.
  2. The second solenoid (with additional turns) was used in place of the first solenoid and the magnet plunged:
  1. Into the solenoid with constant speed
...read more.

Middle

Move N in circulatory path inside

Needle remains on 0

2D

Withdraw N from solenoid

Needle flicks negative

3A

N stationary, solenoid moves up

Needle flicks positive

3B

N stationary, solenoid moves left

Needle remains on 0

4A

Iron core, N plunged into

Needle flicks positive to large reading (4A>2A)

4B

Iron core, N withdrawn

Needle flicks negative to large reading (4B>2D)

5A

N plunged slowly into

Needle flicks positive to small reading

5B

N plunged at medium speed into

Needle flicks positive with greater reading (5B>5A)

5C

N plunged rapidly into

Needle flicks positive with greater reading (5C>5B)

6A

Two Ns plunged in

Needle flicks positive with large reading (6A > 2A)

7A

2nd solenoid, N plunged in

Needle flicks positive with large reading (7A>2A)

ANALYSIS and DISCUSSION:

It is necessary to note that the galvanometer reading measures the current induced through the solenoid.  The equation V = IR shows that I ά V and thus the galvanometer may also gives an indication of induced emf.

STEPS 2A, B and C as well as 3A and B:

These results show that relative motion is needed between the solenoid and the magnet.

...read more.

Conclusion

image02.png

CONCLUSIONS:

In conclusion, the results of this experiment support Faraday’s Law of Electromagnetic Induction which states that:

Whenever the magnetic field in the region of a conductor changes, an electric potential rise (emf) is induced across the conductor. If a circuit is provided, then an electric current will flow through the circuit. The emf induced in a loop is directly proportional to the rate at which the flux through that loop changes with time.

image03.png

The results qualitatively concur with Faraday’s law in that a current was induced when the above conditions were met. As well as concurring with the qualitative demands of Faraday’s Law, the results also support the quantitative section of the law; the equation “emf = NA∆B / ∆t.”  

The results show proportional relationships between:

  • induced current and velocity
  • induced current and magnetic flux density
  • induced current and number of turns on a solenoid.  

image04.png

These three relationships can be derived from Faraday’s initial equation and thus support his findings.

The results also suggest that the presence of an iron core within the solenoid increases the current induced and thus the emf.

...read more.

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