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1. Electric Charges and Fields
medium
The figure shows two situations in which a Gaussian cube sits in an electric field. The arrows and values indicate the directions and magnitudes (in $N-m^2/C$) of the electric fields. What is the net charge (in the two situations) inside the cube?
A
$(1)$ negative $(2)$ positive
B
$(1)$ negative $(2)$ zero
C
$(1)$ positive $(2)$ positive
D
$(1)$ positive $(2)$ zero
(AIIMS-2011)
Solution
The field lines in $1$ are : $(6 + 7)$ out $-(2 + 7+ 15 + 8)$ in $= 19$ (in)
It represents negative charge.
The field lines in $2$ are : $(9 + 5 + 6)$ out $-(7+ 3 + 2)$ in $= 8$ (out)
It represents positive charge.
Standard 12
Physics
