Comprehensive solved notes on Unit 12 Electromagnetism for Class 11 Physics students under the Federal Board of Intermediate and Secondary Education (FBISE), Islamabad. High-quality notes provided in institutions like APS, IMCB Islamabad, and other federal board colleges. Prepared by Hamdard Science Academy for the new NBF course (Cantab publisher). Covers magnetic fields, force on conductors, induction, flux, Faraday’s law, and more. Includes solved examples, derivations, short questions, long questions, numericals, and assignments. For complete guide, solutions, easy notes, and help, download the full PDF at http://hsanotes.com. Join online classes at : sharjeelmuhammad27@gmail.com
12.1 Magnetic Fields in Unit 12 Electromagnetism FBISE Class 11 Physics
Magnetic field is region around magnet or current-carrying conductor with magnetic forces. Vector quantity.
Properties: Lines from North to South outside, closed loops, tangent gives direction, density shows strength, no intersection.
No monopoles: Poles in pairs.
Oersted’s experiment: Current deflects compass.
Right-Hand Rule: Thumb in current, fingers curl in field direction.
More explanations in PDF.
12.2 Magnetic Force on a Current-Carrying Conductor in Unit 12 Electromagnetism FBISE Class 11 Physics
Force on conductor in external field due to interaction.
Derivation: F = B I L sinθ.
Max F when θ=90°, F=BIL; min 0 when θ=0° or 180°.
Fleming’s Left-Hand Rule: Forefinger field, middle current, thumb force.
Detailed derivations in PDF.
12.3 Magnetic Induction / Magnetic Flux Density in Unit 12 Electromagnetism FBISE Class 11 Physics
B is force per unit length on unit current perpendicular to field. B = F/(I L).
Units: Tesla (T), 1 T = 1 N/(A m); Gauss (G)=10^{-4} T.
Explanation and examples in PDF.
12.4 Magnetic Force on a Moving Charge in Unit 12 Electromagnetism FBISE Class 11 Physics
F = q v B sinθ, direction by right-hand for positive charge.
Helical path if velocity not perpendicular.
Solved examples in PDF.
12.5 Motion of a Charged Particle in a Uniform Magnetic Field in Unit 12 Electromagnetism FBISE Class 11 Physics
Circular motion if perpendicular, radius r = m v /(q B).
More in PDF.
12.6 Velocity Selector in Unit 12 Electromagnetism FBISE Class 11 Physics
E and B perpendicular, v = E/B for undeflected particles.
Applications in PDF.
12.7 Magnetic Field Patterns in Unit 12 Electromagnetism FBISE Class 11 Physics
12.7.1 Straight conductor: B = μ0 I /(2 π r).
12.7.2 Circular coil: B at center = μ0 N I /(2 R).
12.7.3 Solenoid: B = μ0 n I, n turns per length.
Right-hand for polarity.
Derivations in PDF.
12.8 Ferrous Core in Solenoid in Unit 12 Electromagnetism FBISE Class 11 Physics
Enhances field, B = μ0 μr n I, μr relative permeability.
More in PDF.
12.9 Magnetic Forces Between Current-Carrying Conductors in Unit 12 Electromagnetism FBISE Class 11 Physics
Attract if parallel same direction, repel opposite.
Ampere definition.
Examples in PDF.
12.10 Magnetic Flux in Unit 12 Electromagnetism FBISE Class 11 Physics
Φ = B A cosθ, unit Weber (Wb).
Max when perpendicular, zero parallel.
In PDF.
12.11 Magnetic Flux Linkage in Unit 12 Electromagnetism FBISE Class 11 Physics
Λ = N Φ, for coil.
In PDF.
12.12 Faraday’s Law of Electromagnetic Induction in Unit 12 Electromagnetism FBISE Class 11 Physics
ε = – dΦ/dt.
Factors: rate of change, turns, area.
In PDF.
12.13 Lenz’s Law in Unit 12 Electromagnetism FBISE Class 11 Physics
Induced current opposes change.
Fleming’s Right-Hand Rule for induced current.
In PDF.
12.14 Seismometer in Unit 12 Electromagnetism FBISE Class 11 Physics
Detects ground motion via induced emf in coil.
Working in PDF.
Solved Short Questions and Responses Unit 12 Electromagnetism FBISE Class 11 Physics
From assignments: Explain direction change if poles reversed – rod moves opposite.
Full solved short questions in PDF.
Solved Long Questions and Responses Unit 12 Electromagnetism FBISE Class 11 Physics
Prove magnetic force does no work: Perpendicular to velocity, W=0.
Full solved long questions in PDF.
Solved Numericals and Assignments Unit 12 Electromagnetism FBISE Class 11 Physics
Assignment 12.1: Draw current direction, explain compass deflection.
Assignment 12.3: r ≈ 0.0948 m for electron orbit.
Numerical 6: F ≈ 12.99 N on wire.
Numerical 7: F ≈ 0.866 N on particle.
Numerical 8: Flux calculation.
Full solved numericals and assignments in PDF for easy notes and solutions.
For complete help, guide, and solutions on unit 12 electromagnetism FBISE class 11 physics new course NBF Cantab, visit http://hsanotes.com to read or download the PDF.
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