Chapter Mock Test
Total Marks:43
Duration:45 min
Total Questions:20
Difficulty:Mixed
Test Structure
- —Section A: 10 MCQs (1 mark each)
- —Section B: 6 Short Answer (3 marks each)
- —Section C: 2 Long Answer (5 marks each)
Preparation Tips
- • Know magnetic field formula B = μ₀I/(2πr) and right-hand rule direction
- • Understand solenoid: B = μ₀nI inside, nearly zero outside
- • DC motor: Split-ring commutator reverses current every half rotation for continuous rotation
- • Force on conductor: F = BIL sinθ. Maximum when perpendicular (θ = 90°)
- • Faraday's law: ε = -N(dΦ/dt). Negative sign represents Lenz's law (opposition)
- • Transformer: Vs/Vp = Ns/Np. Power conserved: Vp × Ip = Vs × Is
- • Fleming's left-hand rule for motor, right-hand for generator
- • Practice motor diagrams showing coil, field, commutator, and force directions
Key Topics Checklist
Magnetic field around straight wire
Ampere's circuital law B = μ₀I/(2πr)
Solenoid magnetic field B = μ₀nI
Electromagnet properties
Force on conductor F = BIL sinθ
Fleming's left-hand rule
DC motor and commutator role
Faraday's law ε = -N(dΦ/dt)
Lenz's law (opposition)
Transformer Vs/Vp = Ns/Np