PYQs
Practise questions grouped by chapter and source year.
Practice questions are organised using the years and labels in our source collection. Work through the solutions with your teacher; these are not a complete official examination paper.
Practice question 1
Source year: 20252 marksState Fleming's left hand rule. In what way this rule is useful for us? [CBSE 2025]
Practice question 2
Source year: 20242 marksDraw a neat diagram showing the magnetic field lines due to a circular loop carrying current. [CBSE 2024]
Practice question 3
Source year: 20235 marksExplain the principle, construction and working of an electric motor with a neat labelled diagram. [CBSE 2023]
Practice question 4
Source year: 20223 marksWhat is electromagnetic induction? State Fleming's right hand rule. [CBSE 2022]
Practice question 5
Source year: 20213 marksAn electric current is flowing through a straight conductor. What is the shape of magnetic field? State the rule to find direction of magnetic field. [CBSE 2021]
Formulae
Revisit important relationships and quick revision formulae.
Magnetic Field due to Straight Conductor
B = (μ₀I)/(2πr) B = Magnetic field, I = Current, r = distance
Magnetic Field in Solenoid
B = μ₀nI n = number of turns per unit length Inside solenoid: uniform field
Force on Current-Carrying Conductor
F = BIL sinθ F = Force, B = Magnetic field, L = Length θ = angle between B and I
Domestic Circuit
Live wire: Red/Brown (220V) Neutral wire: Black/Blue (0V) Earth wire: Green/Yellow (Safety)
Derivations
Work through the reasoning behind key concepts.
Right Hand Thumb Rule
For straight conductor carrying current:
- Thumb → Direction of current
- Fingers → Direction of magnetic field (circular)
Fleming's Left Hand Rule
For force on conductor:
- First finger → Magnetic field (N to S)
- Second finger → Current direction
- Thumb → Force/Motion direction Used in: Electric motor
Fleming's Right Hand Rule
For electromagnetic induction:
- Thumb → Motion of conductor
- First finger → Magnetic field
- Second finger → Induced current Used in: Electric generator
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