11. Three currents are passing through a surface bounded by a closed path. The c

Question

11. Three currents are passing through a surface bounded by a closed path. The currents have different values and directions. According to Ampere's law,(Equation 21.8), what is the value of I on the right side of this equation, 12. Three long, straight wires are carrying currents that have the same magnitude. In C the current is opposite to that in A and B. The wires are equally spaced. Each wire experiences a net force due to the other two wires. Which wire experiences a net force that has the greatest magnitude? 13. The time constant of an RC circuit is 2.9 s. How much time t is required for the capacitor (uncharged initially) to gain one-half of its full equilibrium Charge?

Explanation / Answer

11. I enc = 4 + 3 -5 = 2 A

12) so middle i.e. B will the most since both A and C will ahve fields in the same direction and both are close

13)

Vc = V0 ( 1- e^(-t/tau))

1/2 = 1 - e^(t/tau)

e^(-t/tau) = 1/2

t/tau = ln(2)

t = ln(2)*2.9= 2.01 s

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