When temperature of a ferromagnetic material is increased by 20%, what is the percentage change in it's magnetic susceptibility?

16.7% 83.3% 1.67% 8.33%

16.7%

Magnetic Succeptibility $ X_i  = \frac{C}{T}$ After changing the temperature it becomes $ X_f = \frac{C}{1.2T}$  $\% Change = \frac{X_i - X_f}{X_i} \times 100 = \frac{1}{6} \times 100\% = 16.67\%$