Electromagnetism Practice Questions
ATAR (Australia) · ATAR Physics · 148 free MCQs with instant results and detailed explanations.
148
Total
51
Easy
72
Medium
25
Hard
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Sample Questions from Electromagnetism
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Q1
Easy
What is the direction of the magnetic field around a current-carrying wire?
A.
Perpendicular to the wire, following the right-hand rule
B.
Parallel to the wire, in the direction of current
C.
Aligned with the earth's magnetic field
D.
Opposite to the direction of current flow
Show Answer & Explanation
Correct Answer: A
The direction of the magnetic field around a current-carrying wire is established using the right-hand rule, which states that if you point your thumb in the direction of the current, your fingers will curl around the wire in the direction of the magnetic field.
Q2
Easy
If a loop of wire is placed in a magnetic field and experiences a change in magnetic flux, what phenomenon occurs?
A.
Electromagnetic induction
B.
Magnetic resonance
C.
Electrostatics
D.
Magnetic levitation
Show Answer & Explanation
Correct Answer: A
Electromagnetic induction occurs when there is a change in magnetic flux through a loop of wire, leading to the generation of an electromotive force (EMF) in the wire according to Faraday's law of induction.
Q3
Easy
A charged particle enters a uniform magnetic field perpendicularly. What path does it take?
A.
Straight line
B.
Circular path
C.
Elliptical path
D.
Parabolic path
Show Answer & Explanation
Correct Answer: B
When a charged particle enters a uniform magnetic field perpendicularly, it experiences a magnetic force that acts perpendicular to its velocity, causing it to move in a circular path due to centripetal acceleration.
Q4
Medium
What effect does increasing the number of turns in a solenoid have on the magnetic field strength inside it?
A.
It decreases the magnetic field strength.
B.
It does not affect the magnetic field strength.
C.
It increases the magnetic field strength.
D.
It changes the direction of the magnetic field.
Show Answer & Explanation
Correct Answer: C
Increasing the number of turns in a solenoid increases the magnetic field strength because the field strength inside a long solenoid is directly proportional to the number of turns per unit length.
Q5
Medium
An electron moves perpendicular to a magnetic field of strength 0.2 T with a velocity of 1.5 ร 10^6 m/s. What is the magnitude of the magnetic force acting on the electron? (Charge of electron = 1.6 ร 10^-19 C)
A.
4.8 ร 10^-14 N
B.
3.2 ร 10^-13 N
C.
2.4 ร 10^-14 N
D.
1.2 ร 10^-14 N
Show Answer & Explanation
Correct Answer: A
The magnetic force can be calculated using F = qvB. Here, F = (1.6 ร 10^-19 C) * (1.5 ร 10^6 m/s) * (0.2 T) = 4.8 ร 10^-14 N.
Q6
Medium
A wire loop is placed in a changing magnetic field, inducing an electromotive force (emf) of 12 V. If the resistance of the loop is 4 ฮฉ, what is the current flowing through the loop?
A.
3 A
B.
4 A
C.
2 A
D.
1 A
Show Answer & Explanation
Correct Answer: A
Using Ohm's law, V = IR, we can find the current: I = V/R. Here, I = 12 V / 4 ฮฉ = 3 A.
Q7
Medium
When a charged particle enters a magnetic field at an angle of 30 degrees to the field lines, how does it affect the radius of its path compared to when it's moving perpendicular?
A.
The radius increases.
B.
The radius decreases.
C.
The radius remains the same.
D.
The path becomes circular.
Show Answer & Explanation
Correct Answer: B
When a charged particle moves at an angle to the magnetic field, the magnetic force is less effective, resulting in a smaller radius compared to moving perpendicular, where the force is maximized, causing a larger radius.
Q8
Hard
A long straight wire carries a current of 10 A and is positioned parallel to a second long wire carrying a current of 5 A. If the two wires are 0.2 m apart, what is the magnetic field strength (in teslas) at a point equidistant from both wires?
A.
0.0005
B.
0.0010
C.
0.0025
D.
0.0030
Show Answer & Explanation
Correct Answer: B
The magnetic field due to a long straight wire is given by B = (ฮผโ * I) / (2ฯ * r). For both wires at a point equidistant from them, the contributions add up. Calculating for both wires at 0.1 m gives a total field of 0.0010 T.
Q9
Hard
A coil of wire is placed in a uniform magnetic field of strength 0.5 T. If the coil has 100 turns and an area of 0.02 mยฒ, what is the maximum induced electromotive force (emf) when the coil is rotated 90 degrees in the magnetic field?
A.
0.1 V
B.
0.2 V
C.
0.3 V
D.
0.4 V
Show Answer & Explanation
Correct Answer: B
The induced emf can be calculated using Faraday's law: emf = -N * (ฮฮฆ/ฮt). The maximum change in magnetic flux is ฮฮฆ = B * A when the coil is rotated. The emf comes out to be 0.2 V.
Q10
Hard
A circular loop of wire with a radius of 0.1 m is placed in a uniform magnetic field of strength 0.5 T. If the plane of the loop makes an angle of 30 degrees with the magnetic field, what is the magnetic flux through the loop?
A.
0.025 mยฒT
B.
0.035 mยฒT
C.
0.040 mยฒT
D.
0.050 mยฒT
Show Answer & Explanation
Correct Answer: B
The magnetic flux (ฮฆ) through the loop is calculated using the formula ฮฆ = B * A * cos(ฮธ), where A is the area of the loop. The area A = ฯrยฒ = ฯ(0.1)ยฒ = 0.0314 mยฒ. Thus, ฮฆ = 0.5 * 0.0314 * cos(30ยฐ) = 0.035 mยฒT.
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Electromagnetism โ ATAR (Australia) ATAR Physics Practice Questions Online
This page contains 148 practice MCQs for the chapter Electromagnetism in ATAR (Australia) ATAR Physics. The questions are organized by difficulty โ 51 easy, 72 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.