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Magnetic Fields

Magnets have bewildered everyone from the Insane Clown Posse to Tim Allen. Stand apart from the madding crowd and set yourself straight on the fields of moving charges.

Ampere's law (Qualitative)

         

A current of \( i \) flows through a straight wire \( a, \) and a current of \( 2i \) flows through another straight wire \( b \) which is \( 2d \) away from \( a ,\) 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 \(A, B\) and \(C?\)

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

Current \( i \) 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 \( I, \) as shown in the above figure. What is the direction of the magnetic field at point \( A? \)

A solenoid has current flow \( i ,\) 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 \(A, B\) and \(C?\)

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