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Activity 12.4 — Magnetic Field of a Solenoid
NCERT Activity 12.4: Explore the magnetic field of a solenoid. Inside, the field is uniform; outside, it resembles a bar magnet.
How To Perform
1
Wind the Solenoid
Wind insulated wire around a cylinder and connect to a battery.
2
Observe Field Inside
Pass current and observe the parallel, uniform field lines inside.
3
Compare with Bar Magnet
Notice how the external field is identical to a bar magnet.
4
Understand Solenoid Field
Learn B = μ₀nI and applications in electromagnets.
⚠️ Safety Notes
- •The solenoid wire can get hot with prolonged current — disconnect when not observing.
- •Use low voltage to avoid excessive current.