Komronbek Sattorov 8-sinf darsligidan masalalar




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8-sinf masalalar


Komronbek Sattorov
8-sinf darsligidan masalalar.
1. Nuqtaviy zaryad q ning r masofada hosil qilgan elektr maydon kuchlanganligini toping.

Berilgan

Formula

Yechish

q; r
E-?

’ dan




2. Elektr zanjiridagi lampochkaga parallel ulangan voltmeter 1,5V ni ko`rsatmoqda. Lampochkaga 10C zaryad o`tganda qancha ish bajariladi?



Berilgan

Formula

Yechish

U=1,5V
Q=10C
A-?

,


A=1,5V *10C=15J

3. Elektr zanjirdagi lampochkadan 0,2 A tok o‘tmoqda. Lampochka spirali orqali 1 minutda


qancha zaryad miqdori va nechta elektron o‘tishini hisoblang

Berilgan

Formula

Yechish

I=0.2 A
T=1 min = 60s

q-?
n-?


q=It



q=0.2A*60s=12C

4. Uzunligi 2 m va ko‘ndalang kesimining yuzasi 0,5 mm2 bo‘lgan nixrom simning qarshiligini toping.



Berilgan

Formula

Yechish

L=2m


R-?





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Komronbek Sattorov 8-sinf darsligidan masalalar

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