Answer:
See below, please.
Step-by-step explanation:
I cannot estimate the current sourced/sank by the non-inverting input of the op-amp without additional information about the circuit configuration and operating conditions. However, I can provide some general information about input bias current for the LF411 op-amp. According to the LF411 datasheet, the input bias current for this op-amp is typically 20 nA at room temperature (25°C). This represents the amount of current that is required to bias the input stage of the op-amp and is typically an order of magnitude smaller than the input offset current. The input bias current can vary with temperature and power supply voltage.
If the non-inverting input of the op-amp is connected to a high-impedance source, the input bias current may be the dominant current flowing into the input. In this case, it is important to take the input bias current into account when designing the circuit to ensure that it does not introduce significant errors.It is not possible to compare the input bias current to the current sourced/sank by the non-inverting input of the op-amp without additional information about the circuit configuration and operating conditions.