1.
An atom or a molecule that loses an electron becomes a
- positive ion
- negative ion
- neutral
- conductor
Exercises 5.5 Exercise
2.
Ohms law defines current flow through what type of substance?
- Conductor
- Insulator
- Non-conductor
- Both a. and b.
3.
Which of the following is the symbol of ohms?
- \(\displaystyle \alpha\)
- \(\displaystyle \omega\)
- \(\displaystyle \Omega\)
- \(\displaystyle \beta\)
4.
What substance is attracted to a magnet?
- iron and its alloys.
- silver.
- water.
- all substances.
5.
What happens to the magnetic field when a magnet is strongly heated or hammered?
- becomes weaker.
- is unchanged.
- becomes stronger.
- reverses its direction.
6.
What is the direction of the magnetic field under the power line if a current is flowing through it towards the south?
- east.
- west.
- north.
- south.
7.
A transformer has more turns on its primary coil than on the secondary coil. It is a
- step up transformer
- step down transformer
- None of the above
- both step-up and step-down transformer.
8.
Calculate the force of repulsion between two charges of \(2C\) placed at \(10 cm\) apart.
9.
If two charges placed at 2 cm experience 5 N force. what would be the magnitude of this force if the charges are shifted to 10 cm apart.
10.
Calculate the force of repulsion between two charges of \(2C\) placed at \(10 cm\) apart.
11.
A transformer has 500 turns in its primary coil and is connected to 400 V. Find the voltage in the secondary coil if it has 25 turns.
12.
Recognize the series and parallel circuits from the circuit diagrams given below.
13.
A circuit contains a resistor with a resistance of 20 ohms, connected to a battery with a voltage of 12 volts. What is the current flowing through the circuit?
14.
A circuit has a voltage of 12 volts and a current of 2 amperes. What is the resistance of the circuit?
15.
Electrical Circuit1
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