Moving Charges & Magnetism – Physics 2026

This chapter connects Current Electricity with magnetic effects. It is extremely important for Boards, JEE & NEET 2026. Moving Charges & Magnetism

At CHEMASH, we teach this chapter with deep conceptual clarity, derivations and advanced problem-solving in an affordable tuition model for all classes.

Magnetic Field & Lorentz Force
Biot–Savart Law
Ampere’s Circuital Law
Force on Current Carrying Conductor
Motion in Magnetic Field
Cyclotron
Solved Numericals
MCQs
FAQs

1️⃣ Magnetic Field & Lorentz Force

Force on a moving charge in magnetic field:

F = q (v × B)

q = charge
v = velocity
B = magnetic field

Direction given by Right-Hand Rule.

2️⃣ Biot–Savart Law

Magnetic field due to small current element:

dB = (μ₀ / 4π) (I dl sinθ / r²)

For long straight wire:

B = μ₀I / 2πr

3️⃣ Ampere’s Circuital Law

∮ B · dl = μ₀ I

Used for symmetric cases like:

Infinite wire
Solenoid
Toroid

4️⃣ Force on Current Carrying Conductor

F = BIL sinθ

For two parallel wires:

F/L = μ₀ I₁ I₂ / 2πr

If currents are in same direction → Attraction Opposite direction → Repulsion

5️⃣ Motion of Charged Particle in Magnetic Field

When velocity ⟂ B:

Radius: r = mv / qB Time Period: T = 2πm / qB

This is uniform circular motion.

6️⃣ Cyclotron

Used to accelerate charged particles.

Cyclotron Frequency:

f = qB / 2πm

Very important derivation for JEE.

7️⃣ Solved Numerical

Q: A proton enters 0.5T magnetic field with velocity 2×10⁶ m/s perpendicular to field. Find radius.

r = mv/qB = (1.67×10⁻²⁷ × 2×10⁶) / (1.6×10⁻¹⁹ × 0.5) ≈ 0.0417 m

8️⃣ MCQs (Exam 2026)

1. Unit of magnetic field:
A) Newton
B) Tesla ✔
C) Volt
D) Coulomb

2. Two parallel currents in same direction:
A) Repel
B) Attract ✔
C) No force
D) Oscillate

FAQs

Is this chapter important for NEET 2026?
Yes. Direct formula-based and conceptual questions are common.

Does CHEMASH teach advanced circuit & magnetism numericals?
Yes. We provide weekly problem-solving practice sessions.

Why Study with CHEMASH?

Low-budget tuition for all classes
Experienced Physics teachers
Concept clarity + shortcut tricks
Weekly tests & doubt solving
Trusted brand for Science preparation

Join CHEMASH and master Physics with confidence for 2026 exams.

Current Electricity
Magnetism – Physics Classroom

Tags: #MovingCharges #Magnetism #LorentzForce #BiotSavart #AmpereLaw #Cyclotron #JEE2026 #NEET2026 #CHEMASH

Moving Charges & Magnetism