(A) The TW tube which is a wideband microwave amplifier

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(A) The TW tube which is a wideband microwave amplifier of the helix is used as a slow wave structure of the device.
(R) The phase velocity of the helix can be profiled along the length of the helix.

1. Both A and R are true and R is correct explanation of A
2. Both A and R are true but R is not a correct explanation of A
3. A is true but R is false
4. A is false but R is true

Correct Option: A

NA