If the length of a simple pendulum is equal to the radius of the earth , its time period will be (a) 2pi√(R/g)

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If the length of a simple pendulum is equal to the radius of the earth , its time period will be

(a) 2pi(R/g)

(b) 2pi(R/2g)

(c) 2pi(2R/g)

(d) infinite

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Correct option (b) 2pi(R/2g)

Explanation :