Answer:
The answer is 1.6×10⁶v
Step-by-step explanation:
r=15cm=0.15m
Electric potential =Q/4pi30r²
V=Q/r² ×1/4pi30
V=4×10‐⁶/1.5×10‐¹×9.0×10⁶
V=1.6×10⁶v
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