Question
Fall 2017JSU Physics 212 Test 2B heyu ((hcwthJNumber NaaSgS Name Answer 6. If the potential difference across a resistor is doubled A) only the current is doubled B) only the current is halved C) only the resistance is doubled D) only the resistance is halved E) both the current and resistance are doubled 7. A 4.0 ohm resistor is connected to a battery as in the diagram below, the current i of the circui Answer A) 1.0 A B) 2.0 A C) 3.0 A D) 4.0 A E) 6.0 A 2.0 R-4.0 a 12 V 8. This figure shows a junction. What is true of the currents? Answer R)
Explanation / Answer
here,
6)
as the potential difference across the resistance is doubled
and the resistance is constant
current , I = V/R
so , the current through the resistance is doubled
the correct answer is A)
7)
resistance , R = 4 ohm
the current , I = E /( R + r)
I = 12 /( 4 + 2) A
I = 2 A
the current is B) 2 A