Final answer:
The direct passage of current through a conductive spring does not inherently cause it to expand or compress. Any expansion would be due to thermal effects, assuming the spring heats up significantly. Thus, the correct answer is C. Remain same.
Step-by-step explanation:
If a current is passed through a spring, the spring will not inherently expand or compress solely due to the current. The response of the spring to an electrical current will depend on numerous factors, such as the material of the spring, the amount of current, and any thermal effects that may occur as a result of resistance. Generally, if the spring is made of a conductive material and resistance causes it to heat up, one might expect it to expand slightly due to thermal expansion. However, this is not due to the electrical current directly altering the spring's physical dimensions but rather the heat generated by the resistive properties of the spring material.
The correct response to the question is C. Remain same, assuming that the temperature changes are negligible and do not cause thermal expansion. In situations where a current passing through a conductive material causes it to heat significantly, the material could expand thermally. But for the purposes of this question, which seems to be testing for a direct electromechanical effect, the current itself does not directly cause the spring to expand or compress.