A) Greater than 40 cm
B) Equal to 40 cm
C) Equal to 10 cm
D) Less than 10 cm
Correct Answer: A
Solution :
\[P={{P}_{1}}+{{P}_{2}}-d{{P}_{1}}{{P}_{2}}\Rightarrow P=10-25d\] \[\Rightarrow \]For \[P\] to be negative \[25d>10\] \[\Rightarrow \] \[d>0.4\,m\] or \[d>40\]cmYou need to login to perform this action.
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