Chapter 7: Electricity and Magnetism

Diagram 1 shows a negatively charged electroscope. A negatively charged plastic rod is brought near the brass cap of the electroscope. Which of the following can be observed?

• The gold foil diverges wider

• The gold foil collapses

• The position of the gold foil remains unchanged

• The gold foil diverges then collapses.

Which of the following shows the correct way of connecting the voltmeter to determine the voltage across the bulb?

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Diagram 2 shows the arrangement of four identical resistors in a circuit. What is the effective resistance of the resistor?

• $100\Omega$

• $200\Omega$

• $300\Omega$

• $400\Omega$

Diagram 3 shows the setup of the apparatus to study the pattern of the magnetic field produced by the current flowing in the wires. Which of the following diagrams shows the CORRECT illustration of the magnetic field produced?

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Complete the statements below. Choose whether it is [different / same].

Every resistor in the series circuit receives the ____________ amount of current.

Complete the statement below. Choose whether it is [increase / decrease]

Adding a resistor to a parallel circuit ______________ the effective resistance of the circuit.

Check the correct answers to the electrical components

• Ohmmeter

• Galvanometer

• Voltmeter

• Resistor

Tick the correct statements.

State TWO characteristics of magnetic field lines.

• The closer the field lines, the stronger the magnetic field

• The further the field lines, the stronger the magnetic field

• Magnetic field lines are always converging on each other

• Magnetic field lines never overlap

State the rule used to determine the direction of the magnetic field.

• Left feet grip rule

• Right feet grip rule

• Left hand grip rule

• Right hand grip rule

Based on the table above, which of the following deduces the relationship between the number of turns of a coil and the number of pins attracted?

• The lower the number of turns of a coil, the more number of pins attracted

• The higher the number of turns of a coil, the lower the number of pins attracted

• The higher the number of turns of a coil, the more number of pins attracted

• There is no correlation between the number of turns of a coil with the number of pins attracted.