Assertion (A): When a spring is cut into two equal parts, spring constant of each piece is twice that of the original spring. Reason $(\mathrm{R})$ : Spring constant is inversely proportional to length of the spring.

• Correct answer
  A

  $(A),(R)$ are true : $(R)$ is the correct explanation of $(A)$
• B

  (A), (R) are true : (R) is not the correct explanation of (A)
• C

  (A) is true, (R) is false
• D

  (A) is false, (R) is true

Hence, the correct answer is option: 'A'.