Answer
$(b)$ At an antinode
Work Step by Step
The string of an electric guitar is made of a magnetizable material. As shown in Figure 22.18, the
presence of a permanent magnet inside the pickup coil causes the string to become magnetized
with north and south poles. When the magnetized string is plucked, it oscillates above the pickup
coil, thereby changing the magnetic flux that passes through the coil. The guitar string vibrates in a
standing wave pattern that consists of nodes and antinodes. The magnetic flux will change most
rapidly where the oscillations of the magnetized string are the largest; therefore, the
electromagnetic pickup should be placed at an antinode to produce a maximum emf.
