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Q. 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?Physics Question Image

Electric Charges and Fields

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.