Search Header Logo
Magnetic Fields and Electromagnetism A Level Physics

Magnetic Fields and Electromagnetism A Level Physics

Assessment

Presentation

Physics

12th Grade

Practice Problem

Easy

Created by

Muhammad Arief Kurniawan

Used 4+ times

FREE Resource

19 Slides • 4 Questions

1

media

Magnetic Fields and Electromagnetism

​By Muhammad Arief Kurniawan
Mutiara Harapan Islamic School

2

media

Producing magnetic Field

  1. using a permanent magnet

  2. using the movement of electric charges

media

3

  • The magnetic field lines come out of north poles and go into south poles.

  • The direction of a field line at any point in the field shows the direction of the force that a 'free' magnetic north pole would experience at that point.

  • the field is strongest where the field lines are closest together

Representing magnetic fields

media

4

media

So What is electromagnet?

Basically, we are using electric source (e.g battery) to produce electric current via coil to produce magnetic field. every "field" will forced something to move (either repel or attract).

​Why coil?

​Because coil concentrates the magnetic field. one end become north pole, another end become south pole.


this type of coil called SOLENOID

5

Direction of Field

media
media

​The right-hand grip rule

6

Open Ended

Question image

State which of the pairs of electromagnets shown here attract one another, and which repel.

7

media

Magnetic Force

  1. A current-carrying wire is surrounded by magnetic field.

  2. this magnetic field will interact with external magnetic field.

  3. so giving rise to the force on the conductor (rod).

  4. the magnets give create a fairly uniform magnetic field.

  5. The rod starts to roll, showing the force acting on it. To which direction?

8

Predict the direction of the Force

Using Fleming's Left Hand Rule
or Motor Rule

media
media

​The production of this forced called "motor effect"

9

Explaining the force

media
media

10

Match

Decide whether there is a force, and which direction

no force

yes there is force into the page

yes there is force gdown

11

Magnetic Flux Density

media
media
media

12

Fill in the Blank

The unit of Magnetic flux density is Tesla (T). Please elaborate the unit of Tesla

^
-
^
-

13

Open Ended

a wire of length 50 cm carrying a current lies at right angles to a magnetic field of flux density 5.0 mT.

a. If 10^18 electron pass a point in the wire each second, what current is flowing? (you have to know the charge of 1 e)

b. What force acts on the wire?

14

Measuring Magnetic Flux Density

15

media
media

Measuring B Using Hall Probe

​A Hall Probe must be held so that the field lines are passing directly through it, at right angles to the flat surface of the probe.

16

Measuring B with a current balance

There are two ways to measure the Force.

1. Using a balance to measure the force acting on the wire

2. Using a pivot to measure the motion of the wire

17

​↑

Using a balance

red line is the wire.

when the battery is on, the current flow to the wire.

When the current flow, the force will made the wire pushed up.

Following Newton Third Law, the magnet will be pushed down at the same time.

media

​We can predict the force acting on the wire by calculate the weight written on the balance

18

media

Using pivots

This consists a wire frame that is balanced on two pivots.

when a current flows through the frame, magnetic field push the frame downward or upward according to the direction of the force.

we can balanced the frame using small weighs.

19

Current crossing fields

media

​Remember! There is no force if the current and magnetic field direction is parallel.

Their direction must be at right angles to produce force at max.

20

So What if the angle is not at right angle?

Chill! You still can predict the force. but remember I warned you. The force will be not at max.

media
media

21

media

Forces between currents

22

media
media
media

↔︎

↔︎

23

Thank you❤️
@tsitegar

media

Magnetic Fields and Electromagnetism

​By Muhammad Arief Kurniawan
Mutiara Harapan Islamic School

Show answer

Auto Play

Slide 1 / 23

SLIDE