8/14/2019 dapan_deHK1_Ly11(09-10)coban

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TRNG THPT NGUYN TH MINH KHAI

P N KIM TRA HKI (2009-2010) Mn: Vt L 11 CT c bn Thi gian:45 pht.

Cu 1: (1 im) in tr ca kim loi thng vsiu dn khc nhau th no?* nhit rt thp, in tr ca kim loi thngrt nh nhng ln hn 0.* nhit rt thp, di nhit TC in tr ca cht siu dn bng 0.

Cu 2: Pht biu nh lut Jun Len-x: Nhit lta ra trn mt vt dn t l thun vi in tr cvi bnh phng cng dng in v vi thdng in chy qua vt. 0,5

Q= RI2t. 0,5

Cu 3: (1 im)Bn cht ca dng in trongcht kh:L dng chuyn di c hng ca cc ion dngtheo chiu in trng v cc ion m, ccelectron ngc chiu in trng. Cc ht tiin ny do cht kh b ion ho sinh ra.

Cu 4: (1 im)

Cu 5:(1 im)Bn cht ca tia catt: Tiacatt thc cht l dng electron pht ra tcatt c nng lng ln v bay t do trongkhng gian, c sinh ra khi phng introng cht kh p sut thp.

Cu 6: (1 im)Tia la in l qu trnh phng ilc trong cht kh t gia hai in cc khi in mnh bin phn t kh trung ha thndng v electron t do.

Cu 7: m = 25 pin, n = 5 ....................................................................................................................0Tnh ng I qua bnh in phn I b= 1,5 (A) ................................................................................0,2

Tnh mCu= 0,48 g .............................................................................................................................Tnh R x= 10 .............................................. ...............................................................................

Cu 8:*Cng thc xc nh I0,5*I= 2A .0,5

Cu 9: R 1=240() ; R 2=144()I1= P1/U1= 0,5(A) ; I2= P2/U2= 0,83(A) ...............................................................0,5

Hai n ni tip: I = U/(R 1+R 2)=0,625 (A) ...............................................................0,25 Vy n 1 rt sng, n 2 sng m ...............................................................0,25

Cu 10: I1= 2(A) ; I2= 4(A) ...............................................................0,5 P = R 12I2 = 81 ...............................................................0,25 R 2= 1,2 ...............................................................0,25

U b U c

I bh

U(V)

I(A)

0