Q.The lines of force of an electric field is shown in the figure below. On which point is the electric field intensity maximum ?

The number of field lines per unit area (line density) measures field strength. The field is strongest where lines are packed most closely, i.e. the upper converging region at its narrowest — point D. Option (d).

Key principle from NCERT/CBSE Class 12 Physics (Electric Charges and Fields): the density of electric field lines is proportional to the magnitude of the electric field. Widely-spaced lines → weak field; closely-spaced lines → strong field.

Step 1 — points A and C lie on the lower, widely-spaced lines, so the field there is comparatively weak.

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