Concept simulation 20.4 provides background for this problem and gives you the opportunity to verify your answer graphically. how many time constants (a decimal number) must elapse before a capacitor in a series rc circuit is charged to 65.0% of its equilibrium charge?

The time constant is 1.049.

Explanation:

Given that,

Charge

We need to calculate the time constant

Using expression for charging in a RC circuit

Where, = time constant

Put the value into the formula

Hence, The time constant is 1.049.

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96.77 amp

explanation:

rl = 250/100 = 2.5 ohms.

egl = 250 + (100 × 0.1) + 2 = 262 v.

at 700 r.p.m., eg2 = 262 × 700/1000 = 183.4 v.

if ia is the new current, then eg2 - 2 - (ia × 0.1) = 2.5 ia

which means this will give ia = 96.77 amp.