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Magnetic Field and Magnetic Flux MCQs

Prepare for Magnetic Field and Magnetic Flux MCQs with verified questions, past-paper solutions, and conceptual explanations for CSS, PMS, FPSC, PPSC, and NTS examinations.

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Topic Notes: Magnetic Field and Magnetic Flux

These notes summarize the key preparation context before you attempt the MCQs. Review the topic focus, then practice the questions below with answers and explanations.

Quick Overview

Master Magnetic Field and Magnetic Flux MCQs for Competitive Exams with our comprehensive, verified question bank. Designed for students and competitive exam aspirants across Pakistan, this study resource provides topic-wise practice questions for CSS, PMS, FPSC, PPSC, SPSC, KPPSC, BPSC, NTS, and university entry tests.

Exam Focus
Aligned with FPSC, PPSC, and CSS syllabus criteria for Magnetic Field and Magnetic Flux.
Past Papers
Includes frequently repeated questions from past examinations.
Solved & Verified
Each question features verified answers and conceptual explanations.

Preparation Guide & Key Focus Areas for Magnetic Field and Magnetic Flux MCQs

When preparing for Magnetic Field and Magnetic Flux MCQs (Physics), focus on core definitions, historical timelines, relevant provisions, and commonly tested factual points. Review each question below, test your knowledge against the given options, and inspect the detailed explanation to solidify your understanding.

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31
The Earth's magnetic induction at a certain point is 7 × 10^-5 Wb/m^2. This is to be annulled by the magnetic induction at the centre of a circular conducting loop of radius 5 cm. The required current in the loop is
32
If magnetic field is doubled then magnetic energy density becomes:
33
If two straight long conductors carry current in the same direction, the magnetic force on each other will be
34
If the length of a solenoid (carrying a steady current I) is doubled without changing the number of turns, then magnetic field:
35
A frog can jump higher than normal in a magnetic field because the tissues of a frog are
36
An electron and a proton enter a magnetic field perpendicularly. Both have same kinetic energy. Which of the following is true ?
37
Which law states that magnetization is inversely proportional to temperature, for a fixed value of the field?
38
Mixed He⁺ and O₂⁺ ions (mass of He⁺ = 4 amu and that of O₂⁺ = 16 amu) beam passes a region of constant perpendicular magnetic field. If kinetic energy of all the ions is same then
39
A 20 cm wire carrying a current of 20 A is placed in a uniform magnetic field of 0.5 T. If the wire is held at right angle to the direction of magnetic field then the magnitude of the force acting on the wire is
40
The magnitude of the force on a moving charge carrier is maximum when the angle between the velocity of the carrier and the magnetic field is