To show that a simple pendulum executing a simple harmonic motion it is necessary to assume that

length of the pendulum is small.

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mass of the pendulum is small.

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acceleration due to gravity is small.

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amplitude of the oscillation is small.

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Solution

The correct option is C amplitude of the oscillation is small.
The motion of a simple pendulum is simple harmonic for small angular displacement.

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To show that a simple pendulum executing a simple harmonic motion it is necessary to assume that

The correct option is C amplitude of the oscillation is small.The motion of a simple pendulum is simple harmonic for small angular displacement.

The correct option is C amplitude of the oscillation is small.
The motion of a simple pendulum is simple harmonic for small angular displacement.