A simple pendulum has a bob of mass m an...

A simple pendulum has a bob of mass `m` and swings with an angular amplitude `phi`. The tension in thread is `T`. At a certain time the string makes an angle `theta` with the vertical `(theta le phi)`

`T=mgcostheta` , for all value of `theta`

`T=mgcostheta`, only for `theta=phi`

`T=mg` for `theta=cos^(-1)[(1)/(3)(2cosphi+1)]`

T will be large for smaller value of `theta` .

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b, c, d

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