First slide

Electrostatic potential

Question

The variation of potential with distance r from a fixed point is shown in Fig. 2.127. The electric field at r = 5 cm, is :

Moderate

A

(2.5) V/cm
B

(-2.5) V/cm
C

(-2/5) V/cm
D

(2/5) V/cm

Solution

$E = - \frac{∆ v}{∆ r} = - (- \frac{5}{2} \frac{V}{cm}) = 2.5 V / cm$

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