Electric Field Strength Converter
Convert electric field strength units — V/m, kV/m, N/C, and more. Free online electric field converter for electrostatics, antenna design, and electromagnetic compatibility.
Understanding Electric Field Strength
Electric field strength measures the force per unit charge at a point in space. You express field strength in volts per meter (V/m) or newtons per coulomb (N/C). These units are equivalent.
Electric fields surround charged objects and exert forces on other charges. Field strength indicates how strongly a charge would experience force at that location.
Electric Field Formulas
E = F / q
Definition: Field strength equals force divided by test charge. One V/m equals one N/C.
E = V / d
Uniform field: Field strength equals voltage divided by distance between plates.
E = k × Q / r²
Point charge: Field equals Coulomb constant times charge divided by distance squared.
Example: Parallel plates with 1000 V across 1 cm produce E = 1000 V / 0.01 m = 100,000 V/m or 100 kV/m.
Common Electric Field Conversions
| V/m | kV/m | V/cm | N/C |
|---|---|---|---|
| 1 | 0.001 | 0.01 | 1 |
| 10 | 0.01 | 0.1 | 10 |
| 100 | 0.1 | 1 | 100 |
| 1,000 | 1 | 10 | 1,000 |
| 1,000,000 | 1,000 | 10,000 | 1,000,000 |
Dielectric Strength Reference
| Material | Dielectric Strength (kV/mm) |
|---|---|
| Air (dry) | 3 |
| Paper | 16 |
| Transformer Oil | 24 |
| Glass | 30 |
| Mica | 100 |
| Ceramic | 100 |
Practical Applications
Capacitor Design
Dielectric thickness must withstand operating voltage. A 500 V capacitor with paper dielectric needs at least 500 V / 16 kV/mm = 0.031 mm thickness.
EMC Testing
Electromagnetic compatibility standards specify field immunity levels. Consumer electronics must withstand 3 V/m. Industrial equipment faces 10 V/m requirements.
High Voltage Engineering
Transmission line design considers corona discharge thresholds. Air breaks down at 3 kV/mm under standard conditions. Humidity and pressure affect breakdown voltage.
Antenna Field Measurements
Field strength meters measure radiation from transmitters. Broadcast stations monitor fields to ensure regulatory compliance. Safety zones protect workers from high fields.
Frequently Asked Questions
Are V/m and N/C the same?
Yes, volts per meter and newtons per coulomb are equivalent units. Both describe electric field strength. V/m is more common in engineering. N/C appears in physics contexts.
What field strength is dangerous?
Fields above 10 kV/m cause noticeable effects on humans. Occupational limits range from 5-25 kV/m depending on exposure duration. Air breakdown occurs at 3,000 kV/m.
How do you measure electric field strength?
Use a field mill or electrostatic fieldmeter for DC fields. RF field strength meters measure AC fields from antennas. Probes connect to spectrum analyzers for frequency analysis.
What affects dielectric breakdown?
Temperature, humidity, pressure, and material purity affect breakdown strength. Sharp edges concentrate fields. Voids in insulation create weak points. Contamination reduces breakdown voltage.
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