The table lists information about four devices. A 4 column table with 4 rows. The first column is labeled device with entries W, X, Y, Z. The second column is labeled wire loops with entries 60, 40, 30, 20. The third column is labeled current in milliamps with entries 0.0, 0.2, 0.1, 0.1. The last column is labeled metal core with entries yes, yes, no, no. Which lists the devices in order from greatest magnetic field strength to weakest? W, X, Y, Z W, Z, Y, X X, Z, Y, W X, Y, Z, W

To determine the correct order, we need to know about the relation of magnetic field with number of loops, current and the metal core inside the loop.

How does the magnetic field depend on the number of loops, current flowing through the loop and metal core present inside the loop?

Magnetic field is directly proportional to the number of loops present in a loop. If the number of loops increases, magnetic field also increases.
Also, the current flowing through the loop is directly proportional to the magnetic field i.e. magnetic field increases with the increases of current.
Metal core is magnetic substance. As the permeability of the magnetic substance is greater than that of the free space, so in the presence of metal core the magnetic increases.

What is the order of magnetic field produced by X, Y, Z and W from greatest to weakest?

Here, W loop has 0 current, so it producing 0 magnetic field.
Among X, Y and Z, X has the most number of loops and the highest current. So, X has greatest magnetic field.

Between Y and Z, although they have same current, but Y has more number of loops than that of Z. So, Y has more magnetic field than Z.

Thus, we can conclude that X, Y, Z, W lists the devices in order from greatest magnetic field strength to weakest.

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