[单选题]
A plastic rod carrying a uidu2a m l7maq(y q/d :4com/+sniformly distributed k -)(9wxph6/ umws rwc-lu8 k:.mkyoupositive charge is bent into a quarter-circle/-wp)-omy u(uw 9x kkk lr. u8cmsw:h6. What is the direction of the electric field at point P?
