1) The field just outside a 3.78 cm-radius metal ball is 7.11×102 N/CN/C and points toward the ball. What charge resides

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1) The field just outside a 3.78 cm-radius metal ball
is 7.11×102 N/CN/C and points toward the
ball.
What charge resides on the ball?
Q=_______C
2)
In the figure (Figure 1) the top wire is 1.7
mm -diameter copper wire and is suspended in air due to the
two magnetic forces from the bottom two wires. The current flow
through the two bottom wires is 74 A in each.
Part A
Calculate the required current flow in the suspended wire.
Express your answer using two significant figures.