Passage VII

Ferromagnetic materials become magnetic when they are placed in an external magnetic field.

Figures 1 and 2 are graphs of the total magnetic field, B, versus the intensity of the external magnetic field, H, for Materials X and Y, respectively. (B = µ0 [M + H], where µ0 is a constant and M is the magnetization of the material.) B varies as H is increased from zero, then decreased, then increased again, as shown by the directions of the arrows in the figures. If B is not zero when H returns to zero, a material has been magnetized.

When B or H is positive(negative), it is described as pointing north(south).

39. For a new ferromagnetic material, Z, a partial graph of B versus H is obtained.

If Material Z behaves like Materials X and Y when H is varied as shown in Figures 1 and 2, the remainder of the graph of B versus H for Material Z will look most like which of the following?

Answer and Explanation

Your Answer is

Correct Answer is A

Explanation

Look at figure 1 & figure 2, the two figures are very similar, but differ in the value range of the horizontal and vertical coordinates. So according to the question stem, material Z behaves like materials X & Y, then the graph should be similar to figure 1 & 2, then put together option A and the partial graph in the question stem just like figure 1 & 2