The current is suddenly turned off. How long does it take for the potential difference between points a and b to reach one-half of its initial value

Complete Question

The complete  question is shown on the first uploaded image

Explanation:

From the question we are told that

     The original voltage is  

     The new voltage is

     The capacitance is  

     The first resistance is  

      The second resistance is

Generally the equivalent resistance is  

=>    

=>    

Generally the time constant is mathematically represented as

=>  

=>  

Generally the voltage is mathematically represented as

=>  

=>  

=>  

=>  

=>  

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