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Physics

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 1: Magnetic Field of a Straight Wire, Circular Coil and Solenoid — Picture questions (exam style)

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  • Questions count: 3
  • Passing grade: 60%
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1.
the same wire is rewound with 1/3 of the turns, with the same current (figure). What is the ratio of the new to the original flux density at the centre (or inside)?
the same wire is rewound with 1/3 of the turns, with the same current (figure). What is the ratio of the new to the original flux density at the centre (or inside)?
B₂ : B₁ = 2 : 9
B₂ : B₁ = 1 : 81
B₂ : B₁ = 1 : 9
B₂ : B₁ = 81 : 1
2.
A circular coil (10 turns, r = 5 cm, 3 A) and a long wire in its plane 40 cm from the centre carrying 20 A give fields at the centre that are in the same direction. Which option is correct for the resultant at the centre?
A circular coil (10 turns, r = 5 cm, 3 A) and a long wire in its plane 40 cm from the centre carrying 20 A give fields at the centre that are in the same direction. Which option is correct for the resultant at the centre?
B = 3.87×10−4 T, along the coil’s field
B = 3.77×10−4 T, along the coil’s field
B = 3.67×10−4 T, along the coil’s field
B = 3.87×10−4 T, opposite to the coil’s field
3.
the same wire is rewound with 4 times as many turns, with the same current (figure). What is the ratio of the new to the original flux density at the centre (or inside)?
the same wire is rewound with 4 times as many turns, with the same current (figure). What is the ratio of the new to the original flux density at the centre (or inside)?
B₂ : B₁ = 16 : 1
B₂ : B₁ = 1 : 16
B₂ : B₁ = 32 : 1
B₂ : B₁ = 256 : 1
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