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Class 12 Electromagnetic Induction worksheet
CBSE Physics. Flux, Faraday's and Lenz's laws, motional emf, self- and mutual inductance, generators. Every sheet has 20 questions in three sections and an answer key, and the numbers change every time.
Sample questions
Real questions from this chapter, as the app sets them. Tap Answer to see the answer and working.
Section A · multiple choice
- 1.
A loop of area 210 cm² is in a field of 2 × 10⁻¹ T. If the normal to the loop makes 90° with the field, the flux through it is:
- 2.1 × 10⁻³ Wb
- 4.2 × 10⁻³ Wb
- 1 Wb
- 0 Wb
Answer
(d) 0 Wb
Φ = BA cos θ
- 2.
The flux through each turn of a 402-turn coil changes by 37 mWb in 10 × 10⁻² s. The average induced emf is:
- 148.74 V
- 0.37 V
- 1.4874 V
- 1.4874 × 10⁴ V
Answer
(a) 148.74 V
e = NΔΦ/Δt
- 3.
A rod 5 cm long moves at 20 m/s at right angles to a field of 4 × 10⁻¹ T. The emf across its ends is:
- 1 × 10⁻³ V
- 40 V
- 0.8 V
- 0.4 V
Answer
(d) 0.4 V
e = Blv
Section B · short answer
- 4.
A metal rod 60 cm long spins at 120 rad/s about one end, in a plane at right angles to a field of 1 × 10⁻¹ T. Find the emf between its ends.
Answer
2.16 V
e = ½Bωl²
- 5.
A coil of 128 turns and area 60 cm² rotates at 260 rad/s in a field of 7 × 10⁻¹ T. Find the peak emf.
Answer
139.776 V
e₀ = NBAω
Section C · long answer
- 6.
A rod 100 cm long slides at a steady 17 m/s along rails joined by a 4 Ω resistor, at right angles to a field of 1 × 10⁻¹ T. Find the emf, the current, the force needed to keep it moving, and the power supplied.
Answer
1.7 V; 0.425 A; 0.0425 N; 0.7225 W
e = Blv; I = e/R; F = BIl; P = Fv = e²/R
Fresh sheets for your child
In the app, every Electromagnetic Induction sheet is new: the app remembers the questions your child has already had and leaves them out. Print the sheet as a PDF, or use notebook mode and write the answers in a notebook.
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