Physics Electrostatics MDCAT 2010
PMDC Verified Question 128 of 131
Q.79 Electric intensity is a vector quantity and its direction is
A
Perpendicular to the direction of field
B
Opposite to the direction of force
C
At a certain angle
D
Along the direction of force
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: Along the direction of force
1. Concept:

Electric field intensity (\( \vec{E} \)) defines the region around a charge where a force is exerted. By convention, its direction is defined relative to a positive test charge.

2. Formula:

$$ \vec{E} = \frac{\vec{F}}{q_0} $$

3. Solution:

  • Since electric intensity is force per unit positive test charge, the vector \( \vec{E} \) points in the exact same direction as the electrostatic force \( \vec{F} \) experienced by that positive test charge.


4. Why other options are incorrect:

If it were perpendicular or at an angle, it would violate the vector scalar-multiplication rule \( \vec{F} = q \vec{E} \). It is only opposite if the test charge is negative, but the standard definition assumes a positive test charge.

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