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Two conducting wires (both of the same radius a, but made of different materials) are joined end-to-end to form a single wire, and a current I flows down them, distributed uniformly across the cross-section. The wires have resistivities ρ1 and ρ2. Part A Find the magnitude of the current density J. Part B Find the magnitudes of the electric fields E1 and E2 in each part of the wire. Write your two solutions in terms of the given quantities, and separated by a comma. E1, E2 = ? Part C What is the total amount of charge Q located at the junction?

Two conducting wires (both of the same radius a, but made of different materials) are joined end-to-end to form a single wire, and a current I flows down them, distributed uniformly across the cross-section. The wires have resistivities ρ1 and ρ2. Part A Find the magnitude of the current density J. Part B Find the magnitudes of the electric fields E1 and E2 in each part of the wire. Write your two solutions in terms of the given quantities, and separated by a comma. E1, E2 = ? Part C What is the total amount of charge Q located at the junction?

Two conducting wires (both of the same radius a, but made of different materials) are joined end-to-end to form a single wire, and a current I flows down them, distributed uniformly across the cross-section. The wires have resistivities ρ1 and ρ2. Part A Find the magnitude of the current density J. Part B Find the magnitudes of the electric fields E1 and E2 in each part of the wire. Write your two solutions in terms of the given quantities, and separated by a comma. E1, E2 = ? Part C What is the total amount of charge Q located at the junction?

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Two conducting wires (both of the same radius a , but made of different materials) are joined end-toend to form a single wire, and a current I flows down them, distributed uniformly across the crosssection. The wires have resistivities ρ 1 and ρ 2 .
Part A
Find the magnitude of the current density J .
◻ ◻ A Σ ϕ ? J =
Part B
Find the magnitudes of the electric fields E 1 and E 2 in each part of the wire.
Write your two solutions in terms of the given quantities, and separated by a comma.
◻ ◻ A Σ ϕ E 1 , E 2 =
?
Part C
What is the total amount of charge Q located at the junction?
◻ ◻ A Σ ϕ
?

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