A solenoid consists of 100 circular turns of copper wire. Parts of three turns, A, B and C, are shown below.
When a current flows through the coil,
A. both A and C are repelled by B.
B. A is attracted to B; C is repelled by B.
C. neither A nor C is attracted to or repelled by B.
D. A is repelled by B; C is attracted to B.
E. both A and C are attracted to B.
Answer: E
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