In this task, you are given a question and an answer, you would be asked to create the sentence based on the Question-Answer provided. It should be contained within the Question-Answer provided.

Q: Question: What occurs when an unstable nucleus emits a beta particle and energy? Answer: beta decay

A: Beta decay occurs when an unstable nucleus emits a beta particle and energy.
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Q: Question: For what purpose does liver use the excess carbohydrate? Answer: to synthesize glycogen

A: For to synthesize glycogen purpose does liver use the excess carbohydrate.
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Q: Question: Since the electric field lines point radially away from the charge, they are perpendicular to what? Answer: equipotential lines

A:
Since the electric field lines point radially away from the charge, they are perpendicular to equipotential lines.
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