Question

If the electric field is given by ($5\widehat{i} + 4\widehat{j} + 9\widehat{k}$), the electric flux through a surface of area 20 unit lying in the Y-Z plane will be-

• A. 100 unit
• B. 80 unit
• C. 180 unit
• D. 20 unit

Answer 1

Answer: (D)

20 unit

Answer 2

f_A + f_B + f_C = Q f_A = f_C

\ 2f_A = $\frac { \mathrm { q } } { \epsilon _ { 0 } }$ – f_B or 2f_A = $\frac { \mathrm { q } } { \epsilon _ { 0 } }$ – f

\ f_A = $\frac { 1 } { 2 }$