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Chapter 1 of 12 • Page 1 of 248🔒 Protected PDF • Watermarked
Back to Practice Questions
ElectricalMachine
PrevNext

Inside the magnet, field lines travel from?

A

North to south

B

South to north

C

West to east

D

East to west

Correct Answer

⚙️ TE • Technical Concept & PrincipleElectricalMachine
Option B

South to north

Quick Summary:

Magnetic field lines are continuous closed loops. While outside a magnet the magnetic field lines travel from the North pole to the South pole, inside the body of the magnet they travel from the South pole to the North pole to complete the continuous loop.

⚙️TETechnical SolutionConcept & Principle
💡 Explanation

Magnetic field lines are continuous closed loops. While outside a magnet the magnetic field lines travel from the North pole to the South pole, inside the body of the magnet they travel from the South pole to the North pole to complete the continuous loop.

🔢 Key Formulas

∇⋅B=0\nabla \cdot \mathbf{B} = 0∇⋅B=0 — Gauss's Law for Magnetism (Non-existence of magnetic monopoles)

∮B⋅dA=0\oint \mathbf{B} \cdot d\mathbf{A} = 0∮B⋅dA=0 — Integral form of magnetic flux continuity

⚙️ Working Principle

According to Gauss's Law for Magnetism, the net magnetic flux exiting any closed surface is zero (∇⋅B=0\nabla \cdot \mathbf{B} = 0∇⋅B=0). This implies that isolated magnetic monopoles do not exist and magnetic field lines must form closed, continuous loops without any starting or ending points.

📌 Key Points
  • ▸

    Outside the magnet, magnetic field lines emerge from the North pole and enter the South pole.

  • ▸

    Inside the magnet, magnetic field lines return from the South pole to the North pole.

  • ▸

    Magnetic field lines are continuous, closed loops with no beginning or end.

  • ▸

    The density of field lines indicates the strength of the magnetic field.

🛠️ Applications / Uses
  • ▸

    Designing electromagnetic cores and magnetic circuits in electrical machines.

  • ▸

    Analyzing flux leakage and magnetic path distribution in transformers and motors.

🔄 Comparison Table
FeatureOutside the MagnetInside the Magnet

Direction of Lines

North Pole to South Pole

South Pole to North Pole

Medium

Surrounding air or medium

Ferromagnetic magnetic material

📄 Additional Information
  • ▸

    Option A (North to south) represents the direction of magnetic field lines outside the magnet.

  • ▸

    Option C and Option D (West to east / East to west) are irrelevant directions regarding magnetic pole polarity.

📊 Diagram / Illustration
NSInside: S to NOutside: N to S
✅

B is correct — Inside a magnet, field lines complete the continuous loop by traveling from the South pole to the North pole.

Core Concepts Used
Click any tag to open in AI Tutor
Magnetic Field Lines Magnetic Monopoles Non-existence Gauss's Law for Magnetism
💡 EXAM TIP

Always pay careful attention to whether the question asks for field line direction inside or outside the magnet/solenoid, as exams frequently use this distinction as a trick.

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