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Indian Coast Guard Yantrik Current Electricity — practice questions

Explore 1 free Current Electricity questions in Indian Coast Guard Yantrik Science. Open each question or exercise to read its content, reference answers and available explanation.

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Current Electricity questions and exercises with answers

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When the length of a wire is doubled, the ammeter reading reduces to _____.Read the answer and worked solution →

Worked practice questions

When the length of a wire is doubled, the ammeter reading reduces to _____.

  1. one-fourth
  2. one
  3. half
  4. three-fourths
Show answer and solution

Correct answer: C. half

1. Resistance is directly proportional to length, so doubling length doubles resistance. 2. By Ohm's law I = V/R, doubling R at constant V halves the current. 3. Hence the ammeter reading reduces to half. _Source: RRB Group D CEN-02/2018 PYQ, Q.54._

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