Physics problems

[Rakesh Chaudhary]

http://papers.xtremepapers.com/CIE/...and AS Level/Physics (9702)/9702_s07_qp_4.pdf. Please help me with question no. 3 (b). How do u find the area..to get potential difference between A and B..plz reply soon..

 

[jeffpresidentlo]

Our teacher told us a quicker method instead of counting the grids. I didn't recall that but certainly you could use good of the deduction method. To deduct a smaller area from the rectangle.