What would happen if a circuit with 2 cells, 1 bulb and a closed switch had it switch removed
If the switch is removed from the circuit with two cells, one bulb, and a closed switch, the current flow will be interrupted and the bulb will not light up.
Without the switch, the circuit will be open, meaning there will be an air gap in the path for the electric current to flow. The electric current can only flow in a closed circuit, where there is a complete path for the current to move from the positive terminal of the battery, through the circuit components, and back to the negative terminal of the battery.
As there is no closed path for the current to flow with the switch removed, the circuit will be open and no electric current will be able to reach and light up the bulb.