  We present results for the axial charge and root-mean-square (RMS) radii of
the nucleon obtained from 2+1 flavor lattice QCD at the physical point with a
large spatial extent of about 10 fm. Our calculations are performed with the
PACS10 gauge configurations generated by the PACS Collaboration with the six
stout-smeared $O(a)$ improved Wilson-clover quark action and Iwasaki gauge
action at $\beta$ = 1.82 and 2.00 corresponding to lattice spacings of 0.085 fm
and 0.063 fm respectively. We first evaluate the value of $g_A/g_V$ , which is
not renormalized in the continuum limit and thus ends up with the renormalized
axial charge. Moreover, we also calculate the nucleon elastic form factors and
determine three kinds of isovector RMS radii such as electric, magnetic and
axial ones at the two lattice spacings. We finally discuss the discretization
uncertainties on renormalized axial charge and isovector RMS radii towards the
continuum limit.

High Energy Physics - Lattice