In the absence of electric or magnetic feild does cathode ray travel in steaight line
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Cathode rays travel in straight lines in the absence of electrical or magnetic fields. These rays behave like negatively charged particles in the presence of electrical or magnetic fields. This suggests that cathode rays consist of negatively charged, sub-atomic particles – electrons.
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Cathode ray is ray of electrons .
Force on electron is given by
F =q(v × B ) + q .E
When B and E are zero there is no force on electrons so beam goes without any disturbance
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