Uniform electric field between parallel plates

Steps:

• Convert separation to meters: d = 5 mm = 0.005 m.
• Calculate magnitude using E = V/d: E = 700 V / 0.005 m = 1.4 × 10^5 N C^{-1}.
• Determine direction: electric field points from positive plate to negative plate.
• Based on diagram, Q is positive and P is negative, so field is from Q towards P.

Why D is correct:

• Matches E = V/d formula and direction from positive (Q) to negative (P) plate, per convention.

Why the others are wrong:

• A and C: Incorrect direction; field is not from P towards Q.
• B: Duplicate of D but listed separately; not applicable.

Final answer: D