Electricity and Magnetism Practice Questions
IGCSE (Cambridge) · IGCSE Physics · 133 free MCQs with instant results and detailed explanations.
133
Total
26
Easy
83
Medium
24
Hard
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Sample Questions from Electricity and Magnetism
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Q1
Easy
What happens to the resistance of a wire if its length is doubled, assuming the material and temperature remain constant?
A.
It remains the same.
B.
It becomes half.
C.
It doubles.
D.
It triples.
Show Answer & Explanation
Correct Answer: C
Resistance is directly proportional to the length of the conductor. If the length of the wire is doubled, its resistance also doubles, provided the material and temperature are unchanged.
Q2
Easy
Which material is typically used as an insulator in electrical wiring?
A.
Copper
B.
Aluminum
C.
Plastic
D.
Iron
Show Answer & Explanation
Correct Answer: C
Plastic is commonly used as an insulator because it prevents the flow of electricity, ensuring safety in electrical applications.
Q3
Easy
If a circuit has a resistance of 5 Ohms and a current of 2 Amperes, what is the voltage across the circuit?
A.
10 Volts
B.
7 Volts
C.
5 Volts
D.
2 Volts
Show Answer & Explanation
Correct Answer: A
Using Ohm's Law, V = I ร R. Here, V = 2 A ร 5 โฆ = 10 Volts, showing how voltage relates to current and resistance.
Q4
Medium
What is the effect on the total resistance in a parallel circuit if a resistor is added?
A.
Total resistance decreases
B.
Total resistance increases
C.
Total resistance remains the same
D.
Total resistance becomes zero
Show Answer & Explanation
Correct Answer: A
In a parallel circuit, adding a resistor provides an additional path for current, which decreases the total resistance according to the formula 1/R_total = 1/R1 + 1/R2 + ...
Q5
Medium
What happens to the magnetic field strength around a wire as the electric current increases?
A.
Magnetic field strength decreases
B.
Magnetic field strength remains constant
C.
Magnetic field strength increases
D.
Magnetic field disappears
Show Answer & Explanation
Correct Answer: C
The magnetic field strength around a current-carrying wire increases with the increase of current due to the direct relationship between current and magnetic field intensity.
Q6
Medium
If the voltage across a resistor is doubled while the resistance remains constant, what happens to the power consumed by the resistor?
A.
Power is halved
B.
Power remains the same
C.
Power is doubled
D.
Power is quadrupled
Show Answer & Explanation
Correct Answer: D
Power can be calculated using the formula P = Vยฒ/R. If voltage (V) is doubled, then power becomes (2V)ยฒ/R = 4Vยฒ/R, thus the power consumed is quadrupled.
Q7
Medium
A magnet is brought near a coil of wire. What effect does this have on the coil?
A.
It heats up due to resistance.
B.
It induces an electromotive force (emf).
C.
It attracts the magnet.
D.
It remains unaffected.
Show Answer & Explanation
Correct Answer: B
When a magnet is moved near a coil, it creates a changing magnetic field, which induces an electromotive force (emf) in the coil according to Faraday's law of electromagnetic induction. Hence, option B is correct.
Q8
Hard
A circuit consists of a 12V battery connected to a resistor of 6ฮฉ. What is the power dissipated by the resistor?
A.
24 Watts
B.
12 Watts
C.
2 Watts
D.
6 Watts
Show Answer & Explanation
Correct Answer: A
Using the formula P = V^2 / R, where V is the voltage (12V) and R is the resistance (6ฮฉ), we calculate P = 12^2 / 6 = 144 / 6 = 24 Watts. Therefore, the correct answer is 24 Watts.
Q9
Hard
In a magnetic field, a charged particle moves in a circular path. Which factor has the least influence on the radius of this path?
A.
Charge of the particle
B.
Speed of the particle
C.
Magnetic field strength
D.
Mass of the particle
Show Answer & Explanation
Correct Answer: A
While the charge affects the force experienced by the particle, the radius of the circular path is primarily influenced by mass, speed, and magnetic field strength, as shown in the equation r = mv / (qB). Therefore, the charge has the least impact on the radius.
Q10
Hard
A circuit consists of a 12 V battery, a 4 ฮฉ resistor, and a 2 ฮฉ resistor connected in series. What is the total current flowing through the circuit?
A.
2 A
B.
3 A
C.
1 A
D.
6 A
Show Answer & Explanation
Correct Answer: A
Using Ohm's law, current (I) can be calculated using the formula I = V/R. The total resistance in series is 4 ฮฉ + 2 ฮฉ = 6 ฮฉ. Thus, I = 12 V / 6 ฮฉ = 2 A.
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Electricity and Magnetism โ IGCSE (Cambridge) IGCSE Physics Practice Questions Online
This page contains 133 practice MCQs for the chapter Electricity and Magnetism in IGCSE (Cambridge) IGCSE Physics. The questions are organized by difficulty โ 26 easy, 83 medium, 24 hard โ so you can choose the right level for your preparation.
Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit.