Physics · Electrostatics
Work through this past-paper style MCQ, then read the full explanation. Practice more physics questions on mMCQ with adaptive practice and topic analytics.
The SI unit of the electric field is:
- A
JC-2
- B
N C-I
- C
Nm² C-1
- D
CN2
- E
Nm² C-2
The SI unit of electric field is N C-I
JC⁻²: Incorrect. This unit represents energy per charge squared, which is not the unit for electric field. The electric field is related to force per charge.
E=q/ F
Where:
- E is the electric field,
- F is the force experienced by a small positive test charge qqq placed in the field.
- q is the test charge.
For the electric field due to a point charge Q, the formula is:
E=k∣Q∣/r2
The unit of electric field is Newton per coulomb (N/C). It can also be expressed as volts per meter (V/m) because:
1 N/C=1 V/m
Nm² C⁻¹: Incorrect. This unit is not appropriate for electric field; it combines units of force, distance, and charge incorrectly for electric field.
C N²: Incorrect. This unit doesn't align with the definition of electric field, as it doesn't properly represent force per charge.
Nm² C⁻²: Incorrect. This unit represents a combination of force, distance, and charge squared, which does not correspond to the electric field's definition.
Tagged under Physics · Electrostatics · 2024