Physics 5054 · O Level · Forces on a current-carrying conductor

Forces on a current-carrying conductor — practice question

A coil P with $N$ turns is formed from a wire length of $L$. When it is placed between two magnetic poles, the coil carries a current $I$. A comparable coil Q with $2N$ turns is formed from a wire length of $2L$ of the same wire. It also carries a current $I$ when it is placed between the same magnetic poles. Which coil has the larger resistance, and which coil undergoes the larger turning effect?

  • Agreater resistance: P; greater turning effect: P
  • Bgreater resistance: P; greater turning effect: Q
  • Cgreater resistance: Q; greater turning effect: P
  • Dgreater resistance: Q; greater turning effect: Q

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