Listrik dan Magnet Practice Questions
UN (Indonesia) · UN Fisika · 137 free MCQs with instant results and detailed explanations.
137
Total
36
Easy
76
Medium
25
Hard
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Sample Questions from Listrik dan Magnet
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Q1
Easy
What is the unit of electric current in the International System of Units (SI)?
A.
Volt
B.
Ampere
C.
Ohm
D.
Coulomb
Show Answer & Explanation
Correct Answer: B
The unit of electric current is the Ampere, which measures the flow of electric charge. It is defined as one coulomb per second.
Q2
Easy
If a circuit has a resistance of 5 Ohms and a voltage of 10 Volts, what is the current flowing through the circuit?
A.
2 Amperes
B.
5 Amperes
C.
10 Amperes
D.
50 Amperes
Show Answer & Explanation
Correct Answer: A
Using Ohm's law (V = IR), where V is voltage, I is current, and R is resistance, we rearrange to find I = V/R. Thus, I = 10V / 5ฮฉ = 2A.
Q3
Easy
A magnet has a north and a south pole. What will happen if you cut the magnet in half?
A.
It will create a new south pole only.
B.
It will create two smaller magnets, each with a north and south pole.
C.
The poles will disappear.
D.
It will create only one magnet with two poles.
Show Answer & Explanation
Correct Answer: B
When a magnet is cut in half, each half becomes a smaller magnet with its own north and south pole due to the alignment of magnetic domains within.
Q4
Medium
What is the effect of doubling the voltage in a circuit while maintaining the same resistance?
A.
The current will double.
B.
The current will remain the same.
C.
The current will halve.
D.
The resistance will double.
Show Answer & Explanation
Correct Answer: A
According to Ohm's Law (V = IR), if the voltage (V) is doubled and resistance (R) remains constant, the current (I) must also double.
Q5
Medium
A wire carrying a current of 5 A is placed in a magnetic field of strength 0.2 T. What is the force experienced by the wire if its length in the magnetic field is 2 m and the angle between the wire and the magnetic field is 90 degrees?
A.
1 N
B.
2 N
C.
5 N
D.
10 N
Show Answer & Explanation
Correct Answer: B
The formula for the force on a current-carrying wire is F = BIL sin(ฮธ). Here, B = 0.2 T, I = 5 A, L = 2 m, and ฮธ = 90 degrees (sin(90) = 1). Thus, F = 0.2 * 5 * 2 * 1 = 2 N.
Q6
Medium
When two resistors of 4 ฮฉ and 6 ฮฉ are connected in series, what is the total resistance?
A.
2 ฮฉ
B.
4 ฮฉ
C.
10 ฮฉ
D.
24 ฮฉ
Show Answer & Explanation
Correct Answer: C
In a series connection, the total resistance R is the sum of individual resistances: R_total = R1 + R2 = 4 ฮฉ + 6 ฮฉ = 10 ฮฉ.
Q7
Medium
A capacitor of capacitance 10 ยตF is charged to a voltage of 12 V. What is the energy stored in the capacitor?
A.
0.6 mJ
B.
0.72 mJ
C.
1.2 mJ
D.
1.44 mJ
Show Answer & Explanation
Correct Answer: B
The energy (E) stored in a capacitor is given by the formula E = 1/2 CVยฒ. Substituting C = 10 ยตF (10 x 10^-6 F) and V = 12 V, E = 1/2 * 10 x 10^-6 * (12)ยฒ = 0.72 mJ.
Q8
Hard
Two parallel plates are charged to a potential difference of 500 V and separated by a distance of 0.01 m. What is the magnitude of the electric field between the plates?
A.
25,000 N/C
B.
50,000 N/C
C.
75,000 N/C
D.
100,000 N/C
Show Answer & Explanation
Correct Answer: B
The electric field E between two charged plates is given by E = V/d, where V is the potential difference and d is the distance between the plates. Substituting the given values, E = 500 V / 0.01 m = 50,000 N/C.
Q9
Hard
A long straight wire carries a current of 10 A. Calculate the magnetic field strength at a point 0.05 m away from the wire. (Use ฮผโ = 4ฯ ร 10^-7 Tยทm/A)
A.
4ฯ ร 10^-6 T
B.
2 ร 10^-5 T
C.
1.6 ร 10^-5 T
D.
8 ร 10^-6 T
Show Answer & Explanation
Correct Answer: B
The magnetic field (B) around a long straight conductor is given by the formula B = (ฮผโ * I) / (2 * ฯ * r). Substituting the values: B = (4ฯ ร 10^-7 Tยทm/A * 10 A) / (2 * ฯ * 0.05 m) = 2 ร 10^-5 T.
Q10
Hard
Two parallel wires carrying currents in the same direction are separated by a distance of 0.1 m. If the current in both wires is 5 A, what is the force per unit length acting between the wires? (Use ฮผโ = 4ฯ ร 10^-7 Tยทm/A)
A.
1 ร 10^-5 N/m
B.
2 ร 10^-5 N/m
C.
1.25 ร 10^-5 N/m
D.
3 ร 10^-5 N/m
Show Answer & Explanation
Correct Answer: A
The force per unit length (F/L) between two parallel wires carrying current is given by F/L = (ฮผโ * Iโ * Iโ) / (2 * ฯ * d). For Iโ = Iโ = 5 A and d = 0.1 m, F/L = (4ฯ ร 10^-7 * 5 * 5) / (2 * ฯ * 0.1) = 1 ร 10^-5 N/m.
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Listrik dan Magnet โ UN (Indonesia) UN Fisika Practice Questions Online
This page contains 137 practice MCQs for the chapter Listrik dan Magnet in UN (Indonesia) UN Fisika. The questions are organized by difficulty โ 36 easy, 76 medium, 25 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.