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if electric field is used then we have to apply a very high voltage ,or we may require a very long tube.however ,if a magnetic field is used ,even a small field can produce large deflection ,on the other hand ,the required size of the picture tube will be highly reduced .due to this reason,the magnetic field is uesd to deflect the electron beam in T.V. insted of the electric field.
Not necessarily. They always have opposite electric charges, but you can certainly shoot them both in the same direction through a tube. If they then encounter a magnetic field in the tube, it's true that then they'll curve in opposite directions.
collimator
A degaussing coil is a device used to remove a residual magnetic field, usually from a Cathode Ray Tube (CRT).
Xenon light bulbs work from low pressure vapor. Like street lamps and stadium lights. The vapor is used to produce an ultraviolet light that arouses a phosphor coating in the tube.
Any device with an electrical current will create a magnetic field. A tube of wire coils with a current running through it is called a solenoid and it will produce a magnetic field through the inside of the tube, as well as around it... Sorry, not much for physics.
if electric field is used then we have to apply a very high voltage ,or we may require a very long tube.however ,if a magnetic field is used ,even a small field can produce large deflection ,on the other hand ,the required size of the picture tube will be highly reduced .due to this reason,the magnetic field is uesd to deflect the electron beam in T.V. insted of the electric field.
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On you tube
Magnetron are know are cross field microwave tube because the E field and M field are perpendicular to each other
That would be a TWT amplifier (traveling wave tube).
X ray tube i am not sure but maybe
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The pollen grain produces a narrow tube called the corbicula.
A baby's eustachian tube is more horizontal and with a smaller diameter than an adults.
vacuum tube
the ovaries produce the egg that will floe down the fallopian tube to be fertilised or if not go into your uterus and you have your period.