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Recording-2025-03-24T21:34:35.356Z

A moving charge generates a magnetic field, while a static charge creates an electric field. Magnetic fields interact with compasses, causing alignment based on current direction (right-hand rule).

Variables and Units

  • Magnetic Field (B): Tesla (T)

  • Current (I): Ampere (A)

  • Voltage (V): Volt (V)

Right Hand Rule

  • Usage: Use right hand for notation.

  • Direction Indicators: Up (North), Right (East), Down (South), Left (West).

Current Flow in Wire

  • Conventional current flows from positive to negative.

  • Right Hand Rule: Thumb = current direction, Curl = magnetic field direction.

Solenoid

  • A wire coil generating a magnetic field when current flows. Insulation is necessary to prevent short circuits.

  • Magnetic field strength increases with more loops and higher current.

  • Use right-hand grip method to determine field direction.

Electromagnet

  • A solenoid with a soft iron core enhances the magnetic field. Current direction determines magnetic pole orientation.

  • To strengthen: increase coil number or current.

Current Direction Effect

  • Reversing current flips electromagnet poles.

Practice

  • Use the right-hand rule to solve problems regarding magnetic field direction based on current flow.