the table lists information about four devices.\n|device|wire loops|current (ma)|metal core|\n|----|----|…
the table lists information about four devices.\n|device|wire loops|current (ma)|metal core|\n|----|----|----|----|\n|w|60|0.0|yes|\n|x|40|0.2|yes|\n|y|30|0.1|no|\n|z|20|0.1|no|\nwhich lists the devices in order from greatest magnetic field strength to weakest?\no w, x, y, z\no w, z, y, x\no x, z, y, w\no x, y, z, w
Answer
Explanation:
Step1: Understand magnetic - field factors
The magnetic field strength of an electromagnet depends on the number of wire loops, the current flowing through it, and the presence of a metal core. A greater number of wire loops, a larger current, and the presence of a metal core increase the magnetic - field strength.
Step2: Analyze device W
Device W has 60 wire loops, 0.0 mA current (so no magnetic field due to current), but has a metal core. Since current is 0, its magnetic field is mainly due to the metal core and the number of loops.
Step3: Analyze device X
Device X has 40 wire loops, 0.2 mA current, and a metal core. The current and the metal core contribute to its magnetic - field strength.
Step4: Analyze device Y
Device Y has 30 wire loops, 0.1 mA current, and no metal core. Its magnetic field is due to the current and the number of loops only.
Step5: Analyze device Z
Device Z has 20 wire loops, 0.1 mA current, and no metal core. It has the least number of loops among the non - zero current devices.
Step6: Compare magnetic - field strengths
Device X has a non - zero current, a metal core, and a relatively large number of loops. Device W has a large number of loops and a metal core but no current. Device Y has a smaller number of loops and current compared to X. Device Z has the least number of loops and current among all. So, the order from greatest to weakest magnetic field strength is X, W, Y, Z. But among the given options, considering the impact of current and loops more comprehensively, the correct order is X, Y, Z, W.
Answer:
X, Y, Z, W