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An electron is projected as in figure wi...

An electron is projected as in figure with kinetic energy K, at an angle `theta=45^(@)` between two charged plates. The magnitude of the electric field so that the electron just fails to strike the upper plate, should be greater than:

A

`K/(qd)`

B

`(2K)/(qd)`

C

`K/(2qd)`

D

iInifinite

Text Solution

Verified by Experts

The correct Answer is:
C
If particle will loose KE (in that direction) against work done by electric field `K/2=qEdrArr E=K/(2qd)`
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Knowledge Check

  • An electron is projected as shown in fig. with kinetic energy K, at an angle theta=45^(@) between two charged plates. Ignore the gravity. At what distance from the starting point will the electron strike the lower plate?

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