MDCAT Physics MCQ #561

Current density in a copper wire is 5A/mm². What happens if the wire is replaced with thinner one carrying same current?

MDCAT Physics MCQ #561

  1. Question 1

    Q1. Current density in a copper wire is 5A/mm². What happens if the wire is replaced with thinner one carrying same current?

    • A) Density decreases
    • B) Density increases
    • C) Current reverses
    • D) Density remains same

    Answer: Density increases

    Explanation: Smaller area increases current density. Option A reverses the relationship.