The electric field strength midway between the plates is 100 V/m.
The electric field strength experienced by the charge is the force per unit charge flowing in the field.
The electric field strength midway between the plates is calculated as follows;
E = V/d
where;
Midway between the plates = 12 cm = 0.12 m
E = 12/0.12
E = 100 V/m
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