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Figure shows the electric field lines around three point charges $A, \,B$ and $C$.
$(a)$ Which charges are positive ?
$(b)$ Which charge has the largest magnitude ? Why ?
$(c)$ In which region or regions of the picture could the electric field be zero ? Justify your answer.
$(i)$ Near $A$ $(ii)$ Near $B$ $(iii)$ Near $C$ $(iv)$ Nowhere
Solution
$(i)$ Electric field lines of $A$ and $C$ are outwards. Hence, charges of $A$ and $C$ are positive.
$(ii)$ No. of Electric field lines from $C$ is maximum. Hence, magnitude of charge $C$ is maximum.
$(iii)$ Electric field lines of like charges are opposite to each other. Hence, the electric field can be zero between $\mathrm{A}$ and $\mathrm{C}$ only.
The magnitude of charge at $\mathrm{C}$ is greater than that at $\mathrm{A}$. Hence, the electric field is zero at point near $A.$
