Magnetic Fields and Forces

Quiz by Dina T

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10 questions
• Q1
A long solenoid that has 1,030 turns uniformly distributed over a length of 0.425 m produces a magnetic field of magnitude 1.0 × 10⁻⁴ T at its center. What current is required in the windings for that to occur?
32.8 mA
43.9 mA
14.8 mA
54.7 mA
300s
• Q2
Certain experiments must be performed in the absence of any magnetic fields. Suppose such an experiment is located at the center of a large solenoid so that a current of 1.70 A produces a magnetic field that exactly cancels Earth’s 4.30 x 10⁻⁵ T field. Find the solenoid’s number of turns per meter
24 turns/m
18 turns/m
20 turns/m
15 turns/m
120s
• Q3
A long straight wire carries a current of 2.10 A in the direction shown below. What is the direction of the magnetic field at point P below the wire?
Downward
Out of the page
Into the page
Upward
120s
• Q4
The magnetic field at a distance of 2 cm from a current carrying wire is 4 μT. What is the magnetic field at a distance of 8 cm from the wire?
16 μT
4 μT
0.5 μT
1 μT
120s
• Q5
Using the directions of the current and Magnetic field shown in the image, find the direction of the Force on the wire
Into the page
Out of the page
To the right
To the left
120s
• Q6
A proton of charge 1.6 x 10⁻¹⁹ C moving at 5.20 x 10⁶ m/s through a magnetic field of magnitude 1.78 T experiences a magnetic force of 7.0 x 10⁻¹³ N. What is the angle between the proton’s velocity and the field?
42.9°
28.2°
20.5°
34.8°
300s
• Q7
A horizontal power line of length 44 m carries a current of 2.9 kA as shown below. Earth’s magnetic field has a magnitude of 5.0 x 10⁻⁵ T and makes an angle of 65° with the power line. Find the magnitude of the magnetic force on the power line.
6.88 N
3.76 N
5.78 N
4.25 N
120s
• Q8
Which of the following changes can be made to make an electromagnet stronger?
Decrease the current
Reduce the number of turns
Put an iron core inside the solenoid
Make the solenoid longer
60s
• Q9
The path of a charged particle moving parallel to a uniform magnetic field will be a ___________
parabola
straight line
circle
helix
60s
• Q10
The current in a long wire creates a magnetic field in the region around the wire. How is the strength of the field at distance 𝑟 from the wire center related to the magnitude of the field?
Field directly proportional to r
Field directly proportional to r²
field inversely proportional to r
Field inversely proportional to r²
60s

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