24. Consider the circuit shown in the figure What power is dissipated by the ent

Question

24. Consider the circuit shown in the figure What power is dissipated by the entire resistor circuit? 4 0 24 0 b. 28 W 56 w d. 112 W 4? 24 ? 24 V 3? 24 2 20 Fn 25. What is the equivalent capacitance of the combination shown? 20 ?F a. 29 HF b. 10 pF c. 40 ?F d, 25 ?F 80 uF 20 ?F A charge of 10 nC is distributed uniformly along the x-axis from x--2 m to x +3 m. Which of the following integrals is correct for the electrie potential (relative to zero at infinity) at the point x-+5 on the x-axis? 26. a) 90dx e)

Explanation / Answer

24) a) 44 W

Req = 3 + 1/(1/4 + 1/4) + 1/(1/24 + 1/24 + 1/24)

= 3 + 4/2 + 24/3

= 13 ohms

power dissipated by entire circuit, P = V^2/Req

= 24^2/13

= 44.3 W

25) c) 40 micro F

here th2 four 20 micro F capacitors are in parallel and 80 micro F capacitor is in series.

Ceq = (4*20)*80/(4*20 + 80)

= 40 micro F

26) option c is the correct answer.

dV = k*dq/x

dV = k*lamda*dx/x

= k*(Q/L)*dx/x

= 9*10^9*(10*10^-9/5)*dx/x

= 18*dx/x

total potential, V = integral 18*dx/x (from x = -2 to x = 3)

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