Class 7 Science MCQs (Grade 7) From Textbook

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Class 7 Science Exam Prep: Certification Test 1921

Magnetic Effect and Electric Current Learning App & e-Book: MCQ 1921

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MCQ: 1921

One method of making a strong electromagnet is to increase

  1. voltage in coil
  2. resistance in coil
  3. number of turns in coil
  4. the size of iron bar
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