If the circuit shown has to function as a clamping circuit, which one of the following conditions should be satisfied for sinusoidal signal of period T?

The diode in the circuit given below has V_ON = 0.7V but is ideal otherwise. The current (in mA) in the 4kΩ resistor is __________.

In the ac equivalent circuit shown, the two BJTs are biased in active region and have identical parameters with β >> 1. The open circuit small signal voltage gain is approximately _______.

In the circuit shown, V_O = V_OA for switch SW in position A and V₀= V_OB for SW in position B. Assume that the opamp is ideal.

The value of $${{{V_{OB}}} \over {{V_{OA}}}}$$ is _____