Monday, December 8, 2014

Observe the Magnetic field lines around a current carrying loop By jsunil

Procedure (to be performed in the schoollaboratory)

  • Take a long wire and bend it to form a circle.
  • Pass the wire through the cardboard such that half the wire is above it and the remaining part of the wire is below the cardboard.
  • Join the free ends of the wire to a battery through a plug key.
  • Insert the key and pass the current. Sprinkle iron filings on the cardboard and tap gently.
  • Concentric circles are formed, which are centred at the point where the wirepasses through the cardboard.
  • The lines near the centre of the loop are almost straight. The magnetic field at the centre of the loop is perpendicular to the plane of the loop.
  • The concentric circles become larger as we move away from the wire
Procedure ( to be performed in the simulation )

The EJSMagnetic Field from Loops model computes the B-field created by an electric current through a straight wire, a closed loop, and a solenoid. The user can adjust the vertical position of the slice through the 3D field.

  • Watch the simulation as the field changes from the field around a long straight current-carrying wire to the field near a coil. Explain what happens to the field. Inside a coil of many loops, why is the field fairly uniform near the center (think about vector addition and what vectors would be adding together near the center).
  • There is an arrow on each end of the wire (red and blue).  Which one shows the direction of the current in the wire? Explain.
  • The red arrows indicate the resultant direction of the magnetic field due to the loop.
  • The blue arrows indicate the resultant direction of the individual segments of wire.

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