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Experimental data on $\pi N $ scattering in the elastic energy region $W \leq1.45 GeV $ are analyzed within the $K$-matrix approach with effectiveLagrangians. The charge splitting in $\delta^{++}_{33} $ and $\delta^{0}_{33}$phases obtaned in the phase shift analisys is studed . It is shown that thechange in the sign in the energy dependence of the phase difference can beobtained with different formfactors of the $\Delta^{++}$ and $\Delta^{0}$ only. This means that $\Delta^{++}$ and $\Delta^{0}$ has a different size in $\pi N$ interaction.The underlying nature of the observed phenomena is discussed.

Charge splitting in ${\pi}N\Delta$ formfactor