Electromagnet Spm Paper1

www.physics4spm.com SPM tips & discussion online ELECTROMAGNETISM - PASS YEAR, 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 ?

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www.physics4spm.com SPM tips & discussion online 2. The diagram shows an electromagnet. SPM 2005

Which factor does not influence the strength of the electromagnet ? A Material used for the wire B Material used for insulator of the wire C Number of turns of wire D Current flowing in the wire.. 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

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www.physics4spm.com SPM tips & discussion online 4. The diagram shows a coil of wire placed next to a magnet. The galvanometer pointer deflects when the magnet is pushed into the coil. SPM 2004

Which action will increase the deflection of the galvanometer pointer ? A B C D

The magnetic pole is reversed The number of coils is increased The coil is made from insulated wire The magnet is pushed slowly into the coil.

5. The diagram shows a magnet oscillating in a solenoid.

Which of these will not increase the deflection of the galvanometer pointer ? A B C D

Reversing the polarity of the magnet Increasing the number of coils in the solenoid Decreasing the diameter of the solenoid Increasing the oscillation speed of the magnet.

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Which diagram shows the correct direction of the induced current when the magnet is moved in the direction shown ? SPM 2005

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The diagram shows the structure of an ideal transformer SPM 2005

What is the potential difference across the bulb ? A 7V B 24 V C 30 V D 60 V E 160 V 8 The diagram shows a circuit containing an ideal transformer.

Which statement is correct about the brightness of bulb P and bulb Q ? A Bulb P is brighter than bulb Q B Bulb P and bulb Q have the same brightness C Bulb Q is brighter than bulb P

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www.physics4spm.com SPM tips & discussion online 9. The diagram shows the structural design of an electric motor.

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www.physics4spm.com SPM tips & discussion online 10. The diagram shows an electric generator connected to a cathode ray oscilloscope.

Which trace represents the e.m.f induced in the generator when the coil is rotated at a constant speed.?

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www.physics4spm.com SPM tips & discussion online SPM 2007 11. Diagram 23 shows a solenoid.

Which of the following rules may be used to determine the direction of the current in the coil ? A B C D

Fleming ‘ s Left Hand Rule Fleming ‘ s Right Hand Rule Right Hand Screw Rule Right Hand Grip Rule.

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

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www.physics4spm.com SPM tips & discussion online 13 Diagram 25 shows a transformer connected to a cathode ray oscilloscope ( CRO)

Which of the following wave traces is correct when the extra coil is on the core and connected in series with the secondary coil ?

14 The purpose of using laminated iron core in a transformer is to A B C D

reduce resistance reduce eddy current prevent flux leakage magnetized and demagnetized iron core easily.

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www.physics4spm.com SPM tips & discussion online 15 Diagram 26 shows a model of the transmission of electrical energy and includes three identical bulbs , P ,Q and R.

Which comparison of the brightness of the bubs is correct ? A B C D

P Brightest Bright Brighter Brightest

Q Brighter Brighter Brightest Bright

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R Bright Brightest Bright Brighter

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