This description applies to all questions 2.1-2.3. Two long…
This description applies to all questions 2.1-2.3. Two long coaxial solenoids each carry current I, but in opposite directions as shown in the figure below. The inner solenoid (radius a) has n2 turns per unit length, and the outer one (radius b) has n1. The field B inside the inner coil is given by:
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