Final answer:
The time interval for the capacitor in an RC circuit to reach a ratio of charge of 98% is approximately 4.61 times the time constant.
Step-by-step explanation:
The time interval for the capacitor in an RC circuit, as a multiple of the time constant, to reach a ratio of charge of 98% can be determined by multiplying the time constant (T) by the natural log of the inverse of the desired charge ratio. This can be represented by the equation:
t = -T * ln(1 - desired charge ratio)
For a charge ratio of 98%, the time interval would be approximately 4.61 times the time constant.