Скачать или смотреть working of magnetic field from DC motor experiment

Here is a clear experiment-based explanation of the working of the magnetic field in a DC motor, written to match the kind of hands-on experiments you usually do 🔧⚡
🔬 Experiment: Working of Magnetic Field in a DC Motor
🎯 Aim
To understand how a magnetic field is produced and used in a DC motor to create rotation.
🧲 Materials Required
DC motor (3–12 V)
Battery / DC power supply
Compass 🧭 (or iron filings)
Connecting wires
Switch (optional)
⚙️ Experiment Setup
Connect the DC motor to the battery using wires.
Place a compass near the motor body (not touching it).
Keep the motor shaft free to rotate.
🔄 Procedure
Switch ON the power → motor starts rotating.
Observe the compass needle:
The needle deflects when the motor is ON.
Reverse battery polarity:
Motor rotation direction changes.
Compass needle deflects in the opposite direction.
Switch OFF → compass returns to normal.
🧠 Working Principle (Simple Explanation)
1️⃣ Current Creates Magnetic Field
When DC current flows through the armature coil:
A magnetic field forms around the coil
This follows Right-Hand Thumb Rule ✋
2️⃣ Interaction of Fields
Inside the motor:
Permanent magnets create a fixed magnetic field (N–S)
Current-carrying coil creates its own magnetic field
➡️ These two magnetic fields interact.
3️⃣ Force on the Coil (Lorentz Force)
Because of field interaction:
One side of the coil is pushed up
The other side is pushed down
➡️ This creates torque, making the rotor spin 🔄
4️⃣ Continuous Rotation
The commutator reverses current direction every half-turn
Magnetic force remains in the same rotational direction
Motor keeps rotating continuously
📐 Key Laws Used
Fleming’s Left Hand Rule → direction of force
Right Hand Thumb Rule → direction of magnetic field
Electromagnetism → current → magnetic field
🔍 Observation Table
Condition
Compass
Motor
Power ON
Deflects
Rotates
Polarity reversed
Deflects opposite
Rotates opposite
Power OFF
Normal
Stops
✅ Conclusion
A DC motor works because:
Electric current produces a magnetic field
Two magnetic fields interact
This interaction creates rotational force (torque)
➡️ Electrical energy → Mechanical energy
If you want, I can also explain:
🧪 Magnetic field visualization with iron filings
🔁 DC motor working as a generator
🎥 Script for a YouTube experiment video
Just tell me 👍