Biot-Savart Law and Ampere’s Law MCQs

Prepare for Biot-Savart Law and Ampere’s Law MCQs with verified questions, past-paper solutions, and conceptual explanations for CSS, PMS, FPSC, PPSC, and NTS examinations.

15 Solved Questions • 12 Mins Practice • Updated for 2026 Competitive Exams
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2026 Solved Edition · Updated October 2026 · Verified Editorial Standards

Welcome to the verified preparation module for Magnetism & Electromagnetism on McqsMind. This comprehensive set offers solved multiple-choice questions with answers, detailed explanations, and authentic past-paper style questions aligned with the latest syllabus of Magnetism & Electromagnetism (Physics).

100% Verified Answer Keys CSS, PMS, FPSC, PPSC, NTS Ready 2026/2027 Syllabus Guidelines

Direct Definition & Conceptual Scope

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Biot-Savart Law and Ampere’s Law constitutes an essential examination topic within Physics, evaluating theoretical principles, historical context, and practical problem-solving applications. On MCQsMind, candidates practice verified past-paper solutions, conceptual breakdowns, and syllabus-aligned questions tailored for CSS, PMS, and competitive screening examinations.

Solved Questions

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Topic Notes: Biot-Savart Law and Ampere’s Law

Quick Revision 2 min read 12 key points
Section 1 of 3

1 1. Fundamental Principles

4 points
  • Definition
    Biot-Savart Law: Describes the magnetic field dB generated by an infinitesimal current element Idl at a point in space, stating dB is proportional to Idl sin(theta) divided by r squared.
  • Theory
    Electrostatic Analogy: The Biot-Savart Law is the magnetic equivalent of Coulomb’s Law for electrostatics, as both follow an inverse-square relationship with distance.
  • Definition
    Ampere’s Law: Relates the integrated magnetic field around a closed loop to the electric current passing through the loop, expressed as the line integral of B dot dl equals mu-nought times enclosed current.
  • Fact Jan 2024
    Permeability of Free Space (mu-nought): A physical constant equal to 4pi10^-7 Tesla-meters per Ampere (T·m/A), representing the ability of a vacuum to support magnetic fields.
Section 1 / 3
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1
According to the Biot-Savart Law, the magnetic field dB is inversely proportional to what power of distance r?
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2
What is the magnetic field at a point exactly on the axis of an infinitely long straight wire?
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3
Which component of the magnetic field is calculated using the Biot-Savart Law for a point at distance r from a current element?
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4
In the context of Ampere's Law, what is the significance of the Amperian loop?
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5
What happens to the magnetic field at the center of a circular loop if the radius is doubled while keeping the current constant?
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6
The Biot-Savart Law is analogous to which law in electrostatics?
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7
What is the magnetic field inside an ideal, infinitely long solenoid with n turns per unit length carrying current I?
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8
The direction of the magnetic field produced by a current-carrying wire is determined by:
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9
Which physical quantity is conserved in the context of Ampere's Law in magnetostatics?
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10
For an infinitely long straight wire carrying current I, the magnetic field at a radial distance r is:
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Pedagogical Syllabus Blueprint

Biot-Savart Law and Ampere’s Law MCQs: Preparation Strategy & Exam Blueprint

Examination Weightage & Commission Distribution

In Pakistan's premier competitive examinations—including the Federal Public Service Commission (FPSC General Recruitment & CSS MPT), Punjab Public Service Commission (PPSC Lecturer, Tehsildar & PMS Screening), KPPSC, SPSC, and BPSC—questions derived from Biot-Savart Law and Ampere’s Law MCQs consistently constitute a decisive 10% to 25% weightage of the Magnetism & Electromagnetism paper. Testing agencies frequently evaluate both foundational factual recall and deeper analytical comprehension, requiring aspirants to master key dates, statutory articles, constitutional clauses, and thematic definitions.

High-Yield Conceptual Pillars & Distractor Analysis

Historical trend analysis across past five-year examination cycles demonstrates that examiner traps frequently involve closely matched numerical alternatives, chronologically contiguous treaties, and semantic subtleties in statutory phraseology. When preparing Biot-Savart Law and Ampere’s Law MCQs, candidates must deliberately review the underlying rationale provided for every question rather than merely memorizing raw answer options. Understanding why incorrect distractors fail is the most reliable predictor of achieving top percentiles in computerized and optical mark recognition (OMR) screening tests.

Negative Marking Mitigation & Time Management Protocol

For examinations enforcing negative marking penalties (such as PPSC's 0.25-mark deduction per erroneous response or NTS gatekeeper quotas), an aggressive elimination technique must be deployed. Candidates should systematically rule out improbable options first to elevate probability thresholds from 25% to 50% or 100%. Allocating an average of 45 to 60 seconds per item during mock trials builds the psychological stamina and cognitive precision required to complete 100-question papers within official 90-minute time limits.

Recommended Reference Sources & Statutory Reading

To achieve definitive conceptual mastery in Physics, candidates are advised to cross-reference our solved explanations with primary gazettes, statutory texts, and canonical academic textbooks. Verifying controversial questions against authentic official repositories guarantees that prospective civil servants and professional candidates present incontestable answers during both optical paper evaluations and viva voce departmental interviews.