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Magnets have two poles; the field lines spread out from the north pole and circle back around to the south pole In this activity, you'll watch field lines materialize 

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Draw a magnetic field for each of the following examples A) B) 4 following diagrams correctly represents the magnetic lines of force around a magnet? A) S

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Two other forces which can act in this way are and Magnets have a South Pole and a Pole Magnets create a magnetic around them in which the field lines run

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activity 1 activity 2 worksheets and rubrics Students will be able to detect and draw a magnetic field using compasses 2 these types of magnets on-line, and the text below for more information on cow magnets (PDF format, 205 KB)

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Fill in each circle to indicate the direction of the red tip of the compass needle as the compass is moved around the magnet N S Draw the magnetic field lines of  

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PHYSICS 2.6 Name:

WORKSHEET SEVEN REVIEW OF ELECTROMAGNETISM

1. Magnetism is one of the forces which can act at a distance producing non-contact forces.

Two other forces which can act in this way are

and . Magnets have a South Pole and a

Pole. Magnets create a magnetic

around them in which the field lines run from to . In a strong magnetic field the field lines are together. A compass points in the of the field. The earth"s magnetic field suggests that its iron core behaves like a giant magnet with a

Magnetic pole close to the North Geographic pole.

(field, gravitational forces, electrical forces, North, North, South, South, close, direction)

2. When a wire carries an electric current it generates a magnetic field around itself.

(a) One of the conventions we use in diagrams is a circle to show a wire in cross-section. State whether the current is coming out up out of the page or down into the page in these two diagrams. (b) Name the rule you use to find the magnetic field direction produced by a current. (c) Draw the magnetic fields generated by the indicated flow of current in the following wires. (d) Deduce the direction of the current in the wires below (from the given magnetic fields) and indicate this on the diagrams.

3. The coils shown in the diagram are wound around a soft

iron core. The current direction is indicated by the arrows. (a) Write an N or an S in the end of each electromagnet core to indicate its polarity when the current flows. (b) Suggest two ways that the strength of the electromagnets could be increased.

4. A current passes through the wire

in the direction A to B. Draw an arrow on the diagram to show the force on the wire

5. A single length of wire in the coil of an electric motor is shown in cross-section below and the

magnetic field from the magnets is shown as cutting through the wire from left to right. (a) Draw a labelled arrow on the above diagram showing the direction of the force acting on the wire. (b) If the length of the wire is 6.0 cm and the strength of the magnetic field is 0.09 T, calculate the force on the wire produced by a current of 3.0A. Use the equation F = BIL.

Magnetic field lines

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