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To produce deflection in a television picture tube:

  • A.An electric field is used
  • B.A magnetic field is used
  • C.Both electric and magnetic field are used
  • D.None of the above

Answer: B

A magnetic field deflects the beam in a television picture tube.

Deflection coils around the neck of the tube sweep the electron beam across and down the screen. Magnetic deflection allows much wider deflection angles than electrostatic plates for the same tube length, which is why an oscilloscope uses plates but a television uses coils.

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