Which statements about magnetic pickups are correct?

• A. Neither
• B. A only
• C. Both A and B
• D. B only

Answer: (C)

This question tests recognizing when two statements about how magnetic pickups work are both true. Magnetic pickups operate on electromagnetic induction: when the string moves in the magnetic field, the changing flux through the coil generates a voltage. Many pickups are passive, meaning they produce this output without needing any external power source. If both statements describe aspects that are actually true about magnetic pickups—their ability to convert mechanical motion into an electrical signal through changing magnetic flux, and the fact that passive pickups don’t require external power—then the choice that asserts both is the best fit. The other options would be incorrect because they imply that only one or neither statement is true, which isn’t the case when both aspects are accurate.