EN PHYS 1 –PHYSICS FOR ENGINEERS
2nd semester AY 2022 - 2023
ACTIVITY WORKSHEET
Written by Chuck Hunt
Republic of the Philippines
CAMARINES NORTE STATE COLLEGE
F. Pimentel Avenue, Brgy . 2, Daet, Camarines
COLLEGE OF ENGINEERING
Equipment
1
Modular Circuits
EM-3536-KIT
1
Magnets from Modular Circuits
1
Voltage Sensor
UI-5100
1
No-Bounce Pad
SE-7347
1
Small A-Base
ME-8976
Required but not included:
1
550 Universal Interface
UI-5001
Introduction
The purpose of this experiment is to examine Faraday’s Law of Induction. A magnet
will be dropped through a coil and the voltage across the coil graphed as a function of
time. The total integrated flux as the magnet moves into the coil will be compared to
the flux as it moves out of the coil.
Theory
When the magnetic flux thru a coil of wire changes (as in a magnet falling thru a coil of wire in Figure 1), there is an
EMF (E) generated between the ends of the coil given by Faraday’s Law:
E = -N(dΦ/dt) (1)
where N is the number of turns in the coil and dΦ/dt is the time rate of change of the magnetic flux, Φ, or the derivative
of the magnetic flux with respect to time. The magnetic flux may be thought of as the number of magnetic field lines
(green arrows in Figure 1) passing thru the coil. Integration of Equation 1 yields:
∫E dt = -NΔΦ = [the area under the curve on an E vs. t graph] (2)
where ΔΦ is the total change in flux (or total number of field lines).
Setup
1. Assemble the circuit shown in Figure 2.
2. Plug the Voltage Sensor into Channel A on the 550 Universal Interface. Insert the sensor's banana plugs into
the banana jacks on the circuit module.
3. Place the No-Bounce pad on the table where the magnet will hit. If the magnet hits the table without the pad,
it may break.
Name:
Rating:
Paul Jeremy L. Mendoza
Course/Block:
BSEE 1A
Date:
05/13/2023
Activity No.
3
:
Induction: Magnet through a Coil
Learning Objective:
At the end of this activity, the student must be able to:
1. Discuss the phenomena of induction and generation of EMF
2. Follow the instruction and work collaboratively.
N
S
Figure 1: Falling Magnet
