Fall 2017JSU Physics 212 Test 2B heyu ((hcwthJNumber NaaSgS Name Answer 6. If th

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

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