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Electromagnetic Induction is the chapter that turned physics into electricity for the whole world. For NEET(UG) it is short and very predictable: Faraday, Lenz, motional emf, and self-inductance. The one idea worth feeling rather than memorising is Lenz’s law — nature always opposes the change you are making, and the minus sign in the formula is simply energy conservation writing itself down. Ten questions below. Give them ten honest minutes.
What this chapter carries in NEET(UG)
- Usually 2 questions every year, which is 8 marks.
- Faraday’s law and motional emf are the regular ones.
- Self-inductance, energy in a coil and eddy currents share the rest.
What the syllabus says
In the syllabus (Unit 14, Electromagnetic Induction and Alternating Currents): Faraday’s law, induced emf and current, Lenz’s law, eddy currents, self inductance and mutual inductance.
Taken out in 2024: LC oscillations.
Taken from the NMC syllabus for NEET (UG) 2026, the latest one published. See the full syllabus, unit by unit.
Formulas you must know by heart
| Magnetic flux | Φ = BA cosθ |
| Faraday’s law | e = − N dΦ/dt |
| Motional emf | e = Bvl |
| Induced charge | q = NΔΦ/R |
| Self-inductance | e = − L dI/dt |
| Inductance of a solenoid | L = μ0n2Al |
| Energy stored in an inductor | U = ½LI2 |
| Mutual inductance | e2 = − M dI1/dt |
| Coupled coils | M = k√(L1L2) |
Notice that the induced charge formula has no time in it. However fast or slowly you change the flux, the total charge pushed round the circuit is the same. Only the emf depends on how quickly you do it.
Ten questions. Give yourself ten minutes.
Write your answers down before you scroll. A question you looked up is a question you have not answered.
Q1. The emf induced in a coil depends on
- (a) the magnetic flux through it
- (b) the rate of change of flux through it
- (c) the resistance of the coil
- (d) the current already in it
Q2. Lenz’s law is a direct consequence of the conservation of
- (a) charge
- (b) momentum
- (c) energy
- (d) mass
Q3. A rod of length l moves with velocity v at right angles to a uniform magnetic field B. The emf induced across it is
- (a) Bvl
- (b) Bv/l
- (c) Bl/v
- (d) B/vl
Q4. The SI unit of self-inductance is the
- (a) weber
- (b) tesla
- (c) henry
- (d) farad
Q5. The energy stored in an inductor of inductance L carrying a current I is
- (a) LI2
- (b) ½LI2
- (c) ½L2I
- (d) LI
Q6. The flux through a 100-turn coil changes from 0.02 Wb to 0.06 Wb in 0.2 s. The emf induced is
- (a) 2 V
- (b) 20 V
- (c) 200 V
- (d) 0.2 V
Q7. The mutual inductance of a pair of coils depends on
- (a) the current flowing in them
- (b) their shape, size and relative position
- (c) the emf induced in them
- (d) their resistance
Q8. Eddy currents are put to use in
- (a) the commutator of a motor
- (b) an induction furnace
- (c) an electric fuse
- (d) a rheostat
Q9. If the number of turns of a solenoid is doubled while its length stays the same, its self-inductance becomes
- (a) double
- (b) four times
- (c) half
- (d) unchanged
Q10. The direction of an induced current is decided by
- (a) Faraday’s law
- (b) Lenz’s law
- (c) Ampere’s law
- (d) Ohm’s law
Answer key, with a hint for each
| Q1 | (b) | A steady flux, however large, induces nothing. It is the change that matters, and how fast it happens. |
| Q2 | (c) | If the induced effect helped the change instead of opposing it, you would get energy from nowhere. |
| Q3 | (a) | e = Bvl, the standard result for a rod cutting field lines at right angles. |
| Q4 | (c) | One henry is one volt second per ampere. The weber is for flux and the farad for capacitance. |
| Q5 | (b) | The same shape as ½CV2 for a capacitor and ½mv2 for a moving body. |
| Q6 | (b) | e = NΔΦ/Δt = 100 × 0.04 / 0.2. |
| Q7 | (b) | It is fixed by geometry alone. The current decides the emf, not the mutual inductance. |
| Q8 | (b) | The circulating currents heat the metal directly, which is the whole idea of an induction furnace. In a transformer they are a nuisance, which is why the core is laminated. |
| Q9 | (b) | L goes as the square of the number of turns, so doubling the turns makes it four times. |
| Q10 | (b) | Faraday gives the size of the emf, Lenz gives its direction. |
Now mark yourself honestly
NEET(UG) marks the way it marks. Use the same rule here:
- +4 for a right answer
- −1 for a wrong one
- 0 for a blank
So ten questions here are out of 40. In the real paper, 45 Physics questions are out of 180.
If you scored 32 or more, the basics of this chapter are secure. Move to harder questions, not more of these.
If you scored below 24, do not feel bad about it. You have just found out something useful before the exam did. Go back to the formula table above, learn it properly, and sit these ten again tomorrow.
And if you guessed a few and they landed, count those as wrong. A guess that works once will not work in May.
The full chapter, on a clock
Ten questions tell you a little. Forty-five tell you the truth.
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