Figure 11 shows the magnetic field of a magnet - Edexcel - GCSE Physics - Question 5 - 2020 - Paper 1
Question 5
Figure 11 shows the magnetic field of a magnet.
(a) At which point is the magnetic field strongest?
(b) Figure 12 shows a wire carrying a current.
Draw, on the ca... show full transcript
Worked Solution & Example Answer:Figure 11 shows the magnetic field of a magnet - Edexcel - GCSE Physics - Question 5 - 2020 - Paper 1
Step 1
At which point is the magnetic field strongest?
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Answer
The magnetic field is strongest at point B.
Step 2
Draw, on the card in Figure 12, the magnetic field that is produced by the current.
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Answer
To depict the magnetic field produced by the current, draw concentric circles around the wire, indicating the direction of the field lines using the right-hand rule. The direction of the magnetic field lines follows the curl of the fingers around the wire, with the thumb pointing in the direction of the current.
Step 3
Calculate the force on the roller.
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Answer
Given:
Magnetic flux density, B = 1.2 T
Current, I = 2.5 A
Length, L = 0.060 m
Using the formula, the force can be calculated as:
F=BimesIimesL=1.2imes2.5imes0.060=0.18extN
The force on the roller is 0.18 N.
Step 4
Describe how Fleming’s left-hand rule can be used to determine the direction of the force acting on the roller.
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Answer
Fleming's left-hand rule states that if you hold your left hand with the first finger, second finger, and thumb mutually perpendicular, you can determine the direction of force on the conductor in a magnetic field.
First finger (index) indicates the direction of the magnetic field (from North to South).
Second finger (middle) shows the direction of the current (from positive to negative).
Thumb represents the direction of the force or motion acting on the conductor (roller).
A diagram can be sketched to clarify this relationship.
Step 5
Draw an arrow on Figure 13 to show the direction of the force acting on the roller.
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Answer
Draw an arrow from the roller towards the contacts, indicating the direction of the force acting on the roller.
