At a junction

PHYSICS · Single correct · AP · Physics 2: Algebra-based · Electric Circuits · Electric Circuits

Problem

At a junction, a current of

1.80\,\text{A}

flows toward the point through one wire. Three other wires carry currents labeled

I_1

I_2

, and

I_3

. Currents

I_1

and

I_2

are directed away from the junction with magnitudes

0.75\,\text{A}

and

0.65\,\text{A}

, respectively. Current

I_3

has an unknown magnitude and direction. Which of the following statements about

I_3

is correct? (a)

I_3 = 1.05\,\text{A}

directed away from the junction (b)

I_3 = 0.40\,\text{A}

directed away from the junction (c)

I_3 = 3.20\,\text{A}

directed away from the junction (d)

I_3 = 0.40\,\text{A}

directed toward the junction