Disclaimer: For $4$b$)$ the answer is NOT $31820*10^-4.$

Four charges system

The electric potential at $b$ is zero.

Consider two separate systems, each with four charges of magnitude $q$ arranged in a square of length $L$ as shown above. Points a and $c$ are in the center of their squares while points $b$ and $d$ are hatf way between the lower two charges.

Finiro $1$

Figure $2$

The electric field at $c$ is zero.

The electric potential at $c$ is zero.

The electric potential at $d$ is zero.

The electric potential at a is zero.

The electric field at $b$ is zero.

The electric field at $a$ is zero.

The electric field at $d$ is zero.

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$10p4b$

Using the diagram above, find the magnitude of the electric field at point $d.$ Using the following: $q=1\mathrm{.}15C,L=0\mathrm{.}4m.$

$($Please answer in SI unit and multiply your answer by ${10}^{-4})$

$1\mathrm{.}0$p $4$ a Please select all the statements that are true:

The electric potential at $b$ is zero.

The electric field at $c$ is zero.

The electric potential at $c$ is zero.

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