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A simple pendulum of period T has a meta...

A simple pendulum of period `T` has a metal bob which is negatively charged. If it is allowed to oscillate above a positively charged metal plate, its period will

A

remains equal to `T`

B

less than `T`

C

greater than `T`

D

infinite

Text Solution

Verified by Experts

The correct Answer is:
B
When a negatively charged pendulum oscillates over a positively charged plate, then effective value of `g` increase so according to `T= 2pi sqrt((l)/(g)), T` decreases.
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Knowledge Check

  • A simple pendulum has a metal bob, which is negatively charged. If it is allowed to oscillate above a positively charged metallic plate, then its time period will

    A
    increase
    B
    decrease
    C
    become zero
    D
    remain the same

  • If a pendulum is allowed to oscillate into jar containing water , its ,time period will

    A
    increase
    B
    decrease
    C
    remain same
    D
    none of these

  • The metal bob of a simple pendulum is positively charged and has certain time period in air. If bob oscillates above a negatively charged metal plate. Its time period now

    A
    remains same
    B
    increases
    C
    decreases
    D
    none
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