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Sticky Note
A constant current is tent through a helical coil. The coil ______?
ایک مستقل کرنٹ ایک ہیلیکل کنڈلی کے ذریعے خیمہ ہے۔ کنڈلی ______؟
  1. Produces zero magnetic field at its center
  2. Tends to get shorter
  3. Tends to get longer
  4. None of these
Explanation
  • When a constant current passes through a helical coil, it generates a magnetic field along its axis, similar to a solenoid.
  • The electromagnetic forces between the coil’s turns act inward, causing the coil to contract and shorten rather than expand.

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