When electricity is in motion it exhibits magnetic, ______, or thermal effects.

• A. electric
• B. gravitational
• C. sound
• D. chemical

Answer: (D)

Electric current in motion can produce magnetic, chemical, or thermal effects. The magnetic effect arises because moving charges create a magnetic field around conductors. The thermal effect comes from energy lost due to resistance, turning electrical energy into heat. The chemical effect happens when current drives chemical reactions, such as electrolysis in solutions or at electrodes. Since the question lists magnetic and thermal effects, the third corresponding effect is chemical, which accounts for the chemical changes produced by current.