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  4. If a positively charged pendulum is oscillating in a uniform electric field as shown in diagram. Its frequency compared to that when it was uncharged- <img class=img-fluid question-image alt=image src=https://cdn.tardigrade.in/img/question/physics/9fd65c1e2199a12455d840748cb9b92e-.png />

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Q. If a positively charged pendulum is oscillating in a uniform electric field as shown in diagram. Its frequency compared to that when it was uncharged-
image

Electric Charges and Fields

Solution:

$T =2 \pi \sqrt{\frac{\ell}{ g _{ eff }}}$
$=2 \pi \sqrt{\frac{\ell}{ q +\frac{ qE }{ m }}}$
Hence time period decreases and frequency increases.