Question

Consider the juncion of three wires as shown in the diagram. (Figure 1) The magnitudes of the current density and the diameters for wires 1 and 2 are given in the table. The current directions are indicated by the arrows. Wire Current density (A/mm²) Diameter (mm) 1 2.9 2.0 2 4.8 2.6 Part A Find the current I? in wire 3. Express your answer in amperes to two significant figures. Call current out of the junction positive and current into the junction negative. I? = A

          Consider the juncion of three wires as shown in the diagram. (Figure 1)

The magnitudes of the current density and the diameters for wires 1 and 2 are given in the table. The current directions are indicated by the arrows.
Wire   Current density (A/mm²)   Diameter (mm)
1      2.9                      2.0
2      4.8                      2.6

Part A
Find the current I? in wire 3.
Express your answer in amperes to two significant figures. Call current out of the junction positive and current into the junction negative.
I? = A

Consider the juncion of three wires as shown in the diagram. (Figure 1)

The magnitudes of the current density and the diameters for wires 1 and 2 are given in the table. The current directions are indicated by the arrows.
Wire Current density (A/mm²) Diameter (mm)
1 2.9 2.0
2 4.8 2.6

Part A
Find the current I? in wire 3.
Express your answer in amperes to two significant figures. Call current out of the junction positive and current into the junction negative.
I? = A

Added by Leah R.

University Physics with Modern Physics

Hugh D. Young 14th Edition

Instant Answer

Solved by Expert Sufiyan Alam

03/21/2022

Step 1

The cross-sectional area A of a wire with diameter d is given by the formula A = π(d/2)². So, for wire 2, A = π(4.8/2)² = 18.10 mm². The current I in a wire is given by the product of the current density J and the cross-sectional area A. So, for wire 2, I = JA Show more…

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Consider the junction of three wires as shown in the diagram (Figure 1). The magnitudes of the current density and the diameters for wires 1 and 2 are given in the table: Wire Current density (A/mm²) Diameter (mm) 1 2.9 2.0 2 4.8 2.6 Part A Find the current I₃ in wire 3. Express your answer in amperes to two significant figures. Call current out of the junction positive and current into the junction negative.