What is at Q to cause a force on P?

Answer: Option B

View the explanation

What is at Q to cause a force on P? https://youtu.be/Za3RqrbFdfk

Find length of copper wire Y, given both copper wires X and Y have same R.

Answer: Option D

Refer to the video explanation

Find length of copper wire Y, given both copper wires X and Y have same R but different A https://youtu.be/CV-fbIIbZ-8

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