What causes electric field strength?

Electric charges create electric fields. The field radiates outward from positive charges and inward toward negative charges. Field strength increases near charges and decreases with distance (E = kQ/r² for point charges).

What is dielectric breakdown?

When electric field exceeds a material's dielectric strength, it breaks down—electrons are torn from atoms, creating a conducting path. Air breaks down at about 3 MV/m (3 kV/mm). This is why sparks and lightning occur.

How is electric field related to voltage?

Voltage is the integral of electric field along a path: V = ∫E·dl. For uniform field: E = V/d (voltage divided by distance). A 12V battery across a 1cm gap creates E = 1200 V/m.

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About Electric Field Strength Conversion

Electric field strength (or electric field intensity) measures the force experienced by a unit positive charge at a point in space. It describes both the magnitude and direction of electric forces in a region, determining how charged particles will accelerate and how much stress is placed on insulating materials. Electric field is a vector quantity—at each point in space it has both magnitude and direction, pointing in the direction a positive test charge would be pushed.

The SI unit is volts per meter (V/m), equivalent to newtons per coulomb (N/C)—these two definitions reflect the field's dual nature as both force-per-charge and voltage-gradient. Electric field strength is crucial for understanding capacitor energy storage, insulator breakdown (dielectric strength), electromagnetic compatibility (EMC) testing, antenna near-field behavior, and electrostatic discharge (ESD) protection design. The field determines whether sparks will occur and how electromagnetic waves propagate.

Our converter handles all standard electric field strength units used in physics, high-voltage engineering, and EMC applications.

Common Electric Field Strength Conversions

From	To	Multiply By
V/m	N/C	1 (equivalent)
V/m	kV/m	0.001
kV/m	V/m	1,000
V/m	mV/m	1,000
V/m	V/cm	0.01
V/cm	V/m	100
MV/m	kV/mm	1 (equivalent)
V/m	statV/cm (CGS)	3.336 × 10⁻⁵

Electric Field Strength Unit Reference

Volt per meter (V/m) – The SI unit for electric field strength, expressing voltage gradient or equivalently force per unit charge (1 V/m = 1 N/C). Atmospheric fair-weather field is about 100 V/m pointing downward. EMC immunity testing uses 1-200 V/m depending on application. Radio wave field strengths range from μV/m (distant stations) to V/m (near transmitters).

Kilovolt per meter (kV/m) – 1,000 V/m, common for high-voltage engineering and atmospheric electricity. Under thunderclouds: 10-20 kV/m. Near high-voltage power lines: 1-10 kV/m at ground level. Corona onset on sharp points occurs around 30 kV/cm in air.

Volt per centimeter (V/cm) – 100 V/m, convenient for laboratory experiments and plasma physics. Gas discharge tubes operate at 10-100 V/cm. Electrode gaps in experiments are often specified in V/cm.

Megavolt per meter (MV/m) or kilovolt per millimeter (kV/mm) – These are equivalent: 1 MV/m = 1 kV/mm. This is the scale of dielectric breakdown: air breaks down at ~3 MV/m; transformer oil at 10-15 MV/m; solid polymers at 15-30 MV/m; glass and ceramics at 10-40 MV/m. Insulation specifications use this unit.

Newton per coulomb (N/C) – The force-based definition, dimensionally and numerically equal to V/m. This unit emphasizes that field strength tells you the force on a 1-coulomb charge. Useful in particle physics and accelerator design where force on charged particles matters directly.