3.2 Electromagnetism Paper 1
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www.physics4spm.com ELECTROMAGNETISM: SUBTOPIC 3.2 , SPM PAPER 1 1
The diagram shows an arrangement of apparatus to study the pattern of magnetic fields which are formed when current flows through conductors. SPM 2004
Which magnetic pattern is formed on the cardboard when both switches are closed ?
To answer this, 1st determine the current direction, i.e from + to – terminal.
Then use your right hand thumb rule to determine the direction of the magnetic field. Correct answer: B
www.physics4spm.com 2. The diagram shows an electromagnet. SPM 2005
Which factor does not influence the strength of the electromagnet ? A Material used for the wire Answer: B B Material used for insulator of the wire Insulator doesn’t affect the strength of magnetic field. C Number of turns of wire But material used did influence the strength bcoz D Current flowing in the wire.. different material gives different amount of current flows
3.
When the switch is closed in the circuit below , wire R deflects. SPM 2004
The direction of the deflection can be determined by A B C
Fleming ‘ s right hand rule Fleming’s left hand rule Maxwell ‘s corkscrew rule
Answer: B As current being supplied, so we use FLEMING LEFT HAND rule
www.physics4spm.com 9. The diagram shows the structural design of an electric motor.
When switch is on, direction of current in side A & B is shown above. Applying Flemming left hand rule: On side A, we have a downward force I
Magnetic field
F On side B, we have an upward force F Magnetic field
I Thus the answer is B.
www.physics4spm.com
12. Diagram 24 shows a conductor wire placed in a magnetic field.
When the switch is on , the wire initially moves towards A B C D
W X Y Z
Answer: B , use fleming left hand, u’ll get ‘F’ acting upward.
The diagram shows an arrangement of apparatus to study the pattern of magnetic fields which are formed when current flows through conductors. SPM 2004
Which magnetic pattern is formed on the cardboard when both switches are closed ?
To answer this, 1st determine the current direction, i.e from + to – terminal.
Then use your right hand thumb rule to determine the direction of the magnetic field. Correct answer: B
www.physics4spm.com 2. The diagram shows an electromagnet. SPM 2005
Which factor does not influence the strength of the electromagnet ? A Material used for the wire Answer: B B Material used for insulator of the wire Insulator doesn’t affect the strength of magnetic field. C Number of turns of wire But material used did influence the strength bcoz D Current flowing in the wire.. different material gives different amount of current flows
3.
When the switch is closed in the circuit below , wire R deflects. SPM 2004
The direction of the deflection can be determined by A B C
Fleming ‘ s right hand rule Fleming’s left hand rule Maxwell ‘s corkscrew rule
Answer: B As current being supplied, so we use FLEMING LEFT HAND rule
www.physics4spm.com 9. The diagram shows the structural design of an electric motor.
When switch is on, direction of current in side A & B is shown above. Applying Flemming left hand rule: On side A, we have a downward force I
Magnetic field
F On side B, we have an upward force F Magnetic field
I Thus the answer is B.
www.physics4spm.com
12. Diagram 24 shows a conductor wire placed in a magnetic field.
When the switch is on , the wire initially moves towards A B C D
W X Y Z
Answer: B , use fleming left hand, u’ll get ‘F’ acting upward.
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