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+### Statement
+
+$9.3.6.$ [Insert the problem statement]
+
+### Solution
+
+а)Energy density (magnetic pressure) is calculated using the formula $$P=w=\frac{B^2}{2\mu_0}$$
+Considering the induction to be constant throughout the entire cross-section and equal to $B=\frac{\mu_0I}{2b}$,
+we get a formula for pressure:$$P=\frac{\mu_0I^2}{8b^2}$$
+Hooke's law:
+$$\frac{\Delta}{a}=\frac{P}{E}$$
+$$\Delta=\frac{\mu_0aI^2}{8Eb^2}$$
+б)$$P=\frac{B^2}{2\mu_0}$$
+$$B=\sqrt{2\mu_0P}$$
+$$B_1\approx10Тл$$
+$$B_2\approx35Тл$$
+
+#### Answer
+
+[Insert a concise answer or boxed result]