Answer:
0.5 F
Step-by-step explanation:
since electric field is defined as force per charge!
so, force on test charge is directly proportional to electric field
here new electric field becomes 1/4 of old one
i.e, 4E-->1E
so force is also will become 1/4 of old one
i.e, 2F--> 1/4 × 2F =0.5 F
✌️:)