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Electromagnetism
Task 2.1 6. Briefly explain the factors which
influence the magnetic field strength
Use Manila paper and coloured marker of a solenoid.
pens to neatly draw informative
diagrams that illustrate the Right-hand Force on a current-carrying conductor
FOR ONLINE READING ONLY
grip rule and the Maxwell’s cork screw It is known that, when an electric current
rule. Present your diagrams in class. flows through a conductor, it produces a
magnetic field around the conductor. If a
current carrying conductor is placed within
Exercise 2.1 an external magnetic field, the magnetic
field around the conductor exerts a force
1. Give evidence of the existence of
a magnetic field around a current on the external magnet field and vice
carrying conductor. versa. In turn there will be a force acting
2. Describe how you would use your on the conductor. The direction of the force
right hand to determine the direction exerted on the conductor can be predicted
of a magnetic field around a current using the Fleming’s left-hand rule.
carrying conductor.
3. Write at least two applications of the
Maxwell’s cork screw rule. Activity 2.3
4. In an experiment where an electric Aim: To investigate Fleming’s
current flows through a conductor, a left-hand rule.
clockwise magnetic field is produced Materials: Strong U-shaped magnet,
around the conductor. If a teacher two rigid copper rods (about
decides to reverse the terminals of 2 mm diameter and 20 cm
the battery, what would be the effect long), one piece of rigid
on the magnetic field? copper rod (5 cm long),
5. Use the right-hand grip rule to find wooden block of dimensions
the direction of the magnetic field at (10 cm × 10 cm × 5 cm), three
each of the points labelled A to H in dry cells, switch, connecting
Figure 2.11. wires
Procedure
B A F E 1. Bend the two 20 cm long copper
rods at a point about 2 cm from one
end to form L-shaped copper rods.
D H
C G 2. Fix the L-shaped copper rods on a
wooden block and place a strong
Figure 2.11 U-shaped magnet in such a way
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