Ampere's law (qualitative)

         

A current of i i flows through a straight wire a, a, and a current of 2i 2i flows through another straight wire b b which is 2d 2d away from a, a , as shown in the above figure. Which of the following is an appropriate comparison of the magnitudes of the magnetic field strengths at the three points A,BA, B and C?C?

A solenoid has current flow I, I , as shown in the above figure. What is the direction of the magnetic field at point A? A?

Current i i flows through a straight wire, as shown in the above figure. Which of the following is an appropriate comparison of the magnitudes of the magnetic field strengths?

A toroid has current flow I, I, as shown in the above figure. What is the direction of the magnetic field at point A? A?

A solenoid has current flow i, i , as shown in the above figure. Which of the following is an appropriate comparison of the magnitudes of the magnetic field strengths at the three points A,BA, B and C?C?

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