Emacs. read and write file of another user account on same machine

Emacs. read and write file of another user account on same machine

I have two users ( rajiv which is default ) and hduser(hduser is not in
the sudoers file) on my machine.
How do I read/write the files in account hduser from my emacs in user rajiv?
Currently, when I switch to hduser in the terminal and open the file
/home/hduser/.bashrc via pico,I can edit the file. But it opens in
read-only mode from my emacs in user rajiv