Answer:
Step-by-step explanation:
The charge at the centre that is 33 uC will induce -33 uC on the inner surface and + 33 uC charge on the outer surface of the shell. Since the shell has a net charge of +4 uC,the outer surface must have +37 uC so the shell have net charge of + 4uC .
outer surface +37 uC
inner surface -33 uC
net charge on the shell = +4uC