For the circuit given above, what is the expression for

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For the circuit given above, what is the expression for the voltage V?

1. V_i + V_c
2. V_c
3. R_C dV_c – V_c = 0
  dt
4. R_C dV_c + V_c = 0
  dt

Correct Option: C

From given circuit

i_C = C	dV_C
	dt

V_C = i_CR
or i_CR − V_C = 0

or CR	dV_C	−V_C = 0
	dt