Consider two concentric solenoids of the same length. The inner solenoid has radius a and number of turns N₁. The outer solenoid has radius b, number of turns N₂, and current I (see figure). The mutual inductance between the two solenoids is M. Suppose we now double the radii a and b, double the number of turns №₁ and №₂, and double the current I. What will be the new mutual inductance? A. 2M B. 4M C. 8M D. 16M N₂
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