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In the poteniometer experiement shown in...

In the poteniometer experiement shown in figure, the null point length is `l`. Choose the correct options given below

A

If jockey `J_(2)` is shifted towards right, `l` will increase

B

If value of `E_(1)` is increased, `l` is decreased

C

If value of `E_(2)` is increased, `l` is increased

D

If switch S is closed, `l` will decrease

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