[单选题]
A hydrogen nucleus is held st
: gkz7qu; 4f6kakh*yaationary in a uniform vertical electric
- k(br)zlocx d3o x.;v field, represented by the arrows. Which of
v(r.dl- kooxc3) x;bz the paths shown would require the largest work to be done on the hydrogen nucleus?
A.
B.
C.
D.
参考答案:
D
本题详细解析:
Explanation:
The hydrogen nucleus is a proton, so it has positive charge.
The electric field lines are pointed upwards, meaning the higher potential is below the nucleus, or meaning that the force on the nucleus is upward.
The question asks for the largest work done, therefore we are looking for the largest displacement parallel and in the opposite direction the field lines. This is shown in D.
