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Chapter 1 - Electric Current, Ohms Law and Kirchhoffs Laws

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Chapter 2 - Magnetic Effects of Electric Current and Measuring Instruments

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Chapter 3 - Electromagnetic Induction and AC Dynamo and Transformer

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Chapter 4 - Alternating Current AC Circuits

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Chapter 5 - Dual Nature of Wave and Particle

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Chapter 6 - Atomic Spectra and X-Rays

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Chapter 7 - Lasers and Principles

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Chapter 8 - Modern Electronics and Semiconductors

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Quiz

Lesson 2: Magnetic Force on Currents, Torque and Magnetic Dipole Moment — Picture questions (exam style)

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  • Questions count: 10
  • Passing grade: 60%
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1.
Two parallel wires attract with force F₁. The current in wire 1 is multiplied by 3, in wire 2 by 1, and their separation by 4 (figure). What is F₂ : F₁?
Two parallel wires attract with force F₁. The current in wire 1 is multiplied by 3, in wire 2 by 1, and their separation by 4 (figure). What is F₂ : F₁?
F₂ : F₁ = 16 : 9
F₂ : F₁ = 6 : 4
F₂ : F₁ = 3 : 8
F₂ : F₁ = 3 : 4
2.
A 0.4 m wire is bent once into a square loop and once into a circular loop, carrying 2 A in a 0.1 T field with the loop plane at 0° to the field. Which option is correct?
A 0.4 m wire is bent once into a square loop and once into a circular loop, carrying 2 A in a 0.1 T field with the loop plane at 0° to the field. Which option is correct?
torque on square = 2.00×10−3 N m, ratio circle : square = 1
torque on square = 8.00×10−3 N m, ratio circle : square = 1
torque on square = 2.00×10−3 N m, ratio circle : square = 1.27
torque on square = 2.00×10−3 N m, ratio circle : square = 0.785
3.
A rectangular coil (200 turns, 3.00 cm × 2.00 cm) carries 1 A in a 0.1 T field; its plane makes 0° with the field lines. Find the torque.
A rectangular coil (200 turns, 3.00 cm × 2.00 cm) carries 1 A in a 0.1 T field; its plane makes 0° with the field lines. Find the torque.
0.0120 N m
0.0240 N m
6.00×10−5 N m
0.0209 N m
4.
A proton enters a uniform 0.05 T field at right angles with speed 1.00×106 m s−1 as shown. Find the radius of its path.
A proton enters a uniform 0.05 T field at right angles with speed 1.00×10⁶ m s⁻¹ as shown. Find the radius of its path.
0.209 m
0.418 m
4.79 m
2.09×105 m
5.
Find the magnetic dipole moment of the coil shown (250 turns, 4.00 cm × 3.00 cm, 1 A).
Find the magnetic dipole moment of the coil shown (250 turns, 4.00 cm × 3.00 cm, 1 A).
0.300 A m2
1.20×10−3 A m2
0.150 A m2
0.600 A m2
6.
In a moving-coil galvanometer the turns are multiplied by 2, the flux density by 1 and the spring constant by 1. What is the new : old sensitivity (θ/I)?
In a moving-coil galvanometer the turns are multiplied by 2, the flux density by 1 and the spring constant by 1. What is the new : old sensitivity (θ/I)?
new : old sensitivity = 2 : 1
new : old sensitivity = 1 : 4
new : old sensitivity = 2 : 2
new : old sensitivity = 4 : 1
7.
Find the magnetic dipole moment of the coil shown (200 turns, 10.0 cm × 3.00 cm, 3 A).
Find the magnetic dipole moment of the coil shown (200 turns, 10.0 cm × 3.00 cm, 3 A).
1.44 A m2
3.60 A m2
9.00×10−3 A m2
1.80 A m2
8.
Find the magnetic dipole moment of the coil shown (100 turns, 3.00 cm × 5.00 cm, 0.1 A).
Find the magnetic dipole moment of the coil shown (100 turns, 3.00 cm × 5.00 cm, 0.1 A).
1.50×10−4 A m2
0.0150 A m2
3.75×10−3 A m2
0.0300 A m2
9.
Find the magnetic dipole moment of the coil shown (100 turns, 2.00 cm × 6.00 cm, 0.1 A).
Find the magnetic dipole moment of the coil shown (100 turns, 2.00 cm × 6.00 cm, 0.1 A).
6.00×10−3 A m2
1.20×10−4 A m2
0.0240 A m2
0.0120 A m2
10.
Two parallel wires attract with force F₁. The current in wire 1 is multiplied by 1, in wire 2 by 3, and their separation by 1 (figure). What is F₂ : F₁?
Two parallel wires attract with force F₁. The current in wire 1 is multiplied by 1, in wire 2 by 3, and their separation by 1 (figure). What is F₂ : F₁?
F₂ : F₁ = 9 : 1
F₂ : F₁ = 1 : 3
F₂ : F₁ = 3 : 1
F₂ : F₁ = 6 : 1
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