A cell has internal resistance r and electromotive force (e.m.f.) E. The cell is connected in series with an ammeter and a variable resistor of resistance R.
When R is $10\Omega $ the ammeter reads 0.3 A.
When R is $5\Omega $ the ammeter reads 0.4 A.
What is the value of E ?
1 )
0.5 V
2 )
2 V
3 )
3 V
6 V
تحلیل ویدئویی تست
منتظریم اولین نفر تحلیلش کنه!