Electric Field Calculator
Calculate electric field strength (N/C) from a point charge, parallel plates, or two-charge superposition. Includes electric potential, force, and energy.
μC
m
Electric Field
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Electric Potential —
Force on 1 μC Test Charge —
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μC
m
Electric Field E
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Electric Potential —
Force on 1 μC —
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μC
m
Field Strength
Electric Field (E) —
Electric Potential (V) —
Components & Force
E field — X component —
E field — Y component —
Force on test charge —
Potential Energy (U) —
How to Use This Calculator
- Enter the source charge in microcoulombs (μC).
- Enter the distance from the charge in meters.
- Click Calculate to get electric field strength, electric potential, and force on a 1 μC test charge.
- Use Extended tabs for parallel plates or two-charge problems.
Formula
E = kQ ÷ r² (Point Charge)
k = 8.99 × 10⁹ N·m²/C² (Coulomb's constant)
Electric Potential: V = kQ ÷ r
Force on test charge q: F = qE
Example
Example: Q = 2 μC, r = 0.3 m → E = (8.99×10⁹ × 2×10⁻⁶) ÷ 0.09 = 199,778 N/C
Frequently Asked Questions
- An electric field is a region around a charged object where another charge experiences a force. Its strength E (N/C or V/m) equals the force per unit positive test charge: E = F ÷ q.
- E = kQ ÷ r², where k = 8.99×10⁹ N·m²/C², Q is the source charge in coulombs, and r is the distance in meters.
- E = V ÷ d, where V is the voltage across the plates and d is the separation in meters. The field is uniform between ideal parallel plates.
- Electric potential V (volts) at distance r from charge Q is V = kQ ÷ r. It represents potential energy per unit charge. Unlike field, potential is a scalar.
- The net electric field is the vector sum of fields from all individual charges. For charges on a line, fields pointing in opposite directions subtract; same direction fields add.