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When a spring is cut into n parts, spring constant for each part = nk. Here, n = 4.

1. keq = k1k2/(k1 + k2)
2. keq = k1k2
3. keq = k1 + k2
4. keq = k1k2/(k1 + k2)

Correct answer: keq = k1k2/(k1 + k2)

Solution

When a spring is cut into n parts, the spring constant of each part becomes n times the original spring constant. The equivalent spring constant for two springs in series is given by keq = k1k2 / (k1 + k2).

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