Biot-Savart Law & Circular Coils
Given below are two statements:
Statement (I): When currents vary with time, Newton's third law is valid only if momentum carried by the electromagnetic field is taken into account
Statement (II): Ampere's circuital law does not depend on Biot-Savart's law.
In the light of the above statements, choose the correct answer from the options given below:
Show answer and solution
Answer: (d)
- Statement I: with time-varying currents, the magnetic forces between elements need not be equal and opposite; momentum balance holds only when the field's momentum is included. True.
- Statement II: Ampere's circuital law is derived from (and equivalent to) the Biot-Savart law for steady currents, so it does depend on it. False.
- So the answer is (d) Statement I is true but Statement II is false.