... = R2 thỡ cụng sut ca mch in u bng Khi ú tớch s R1.R2 l: A 2.104 B 102 C 2.102 D 104 -II - PHN RIấNG - Thớ sinh ch c lm phn PHN BAN C BN Cõu 41: Khi mc t in cú in dung C1 vi cun cm L thỡ tn s ... gia hai bn t in Cõu 37: Mt ng Rnghen cú hiu in th gia ant v catt l 25kV, cho h = 6,625.1 0-3 4 Js, c = 3.108m/s Bc súng ngn nht ca tia Rnghen m ng cú th phỏt l: A 4,969.1 0-1 0m 0,4969A0 B 4,969nm ... Bit tc ban u ca quang electron l 4,1.105m/s v t trng B = 1 0-4 T Tỡm bỏn kớnh qu o ca quang electron ú.Cho me=9,1.1 0-3 1kg, 19 qe =1,6.1 0- C A 23,32mm B 233,2mm C 6,63cm D 4,63mm Cõu 20: Mt cht im...