015) Electric fields

Why is an electric field measured only by a small test charge?

• so the charge doesn’t disturb the field

• because small charges have small momentum

• so its size doesn’t nudge the charge to be measured aside

• because an electron always is used as the test charge and electrons are small

A force of 14 N exists on charge q, which is 2.1x10^-9 C. What is the magnitude of the electric field?

• 0.15x10^-9 N/C

• 6.7x10^-9 N/C

• 29x10^-9 N/C

• 6.7x10⁹ N/C

Tags

NGSS.HS-PS2-4

A positive test charge of 8.7 μC experiences a force of 8.1x10^-6 N at an angle of 24° N of E. What are the magnitude and direction of the electric field strength at the location of the test charge?

• 7.0x10^-8 N/C, 24° N of E

• 1.7x10^-6 N/C, 24° S of W

• 1.1x10^-3 N/C, 24° W of S

• 9.3x10^-1 N/C, 24° N of E

A positive test charge of 4.0x10^-6C is in an electric field that exerts a force of 2.0x10^-4 N on it. What is the magnitude of the electric field at the location of the test charge?

• 5.0x10¹ N/C

• 2.0x10² N/C

• 4.0x10² N/C

• 8.0x10² N/C

Tags

NGSS.HS-PS2-4

An electric field strength of 6.0x10⁴ N/C is measured using a positive test charge of 2.5x10^-6C. What is the force on the test charge?

• 0.15N

• 0.42N

• 1.5N

• 4.2N

The diagram shows a positive test charge in an electric field and the force the test charge experiences. What is the charge if the electric field strength is 1.2x10⁵N/C?

• 1.1x10^-6C

• 2.7x10^-6C

• 4.7x10^-6C

• 6.4x10^-6C

What is the direction of the electric field at the location of the test charge?

• 25° north of east

• 25° north of west

• 25° south of east

• 25° south of west