Electrical potential and Potential energy-Basics

Electric potential ____________ as distance increases.

• Increases

• Decreases

• Remains Constant

• Is 0

Tags

NGSS.HS-PS2-4

The SI unit for electric potential is the ___________.

• Volen

• Vespa

• Volt

• Valspar

Electrostatic potential energy is recorded in units of electron-Volts (eV). What is equivalent to 1 eV?

• 1.602×10⁻¹⁹ 𝐽

• 100 𝐽

• 220 𝐽

• 0.003 𝐽

The direction of electric field lines shows the

• direction of the force on a test positive charge.

• size of the field.

• strength of the field.

• all of the above

Two charges +q and -3q are placed at a distance of 1m apart. The points on the line joining two charges, where electric potential is zero, is :

• 0.25 m, 0.5 m

• 1 cm , 0.50 m

• 0.35 cm , 24 cm

• none of these

Suppose the electrostatic potential at some points in space are given by V = ( x² - 2x ). The electrostatic field strength at X= 1 is :

• zero

• -2

• 2

• 4

The magnitude of electric potential is ______ at an infinite distance.

• 0

• negative infinity

• positive infinity

• 200

Tags

NGSS.HS-PS2-4

NGSS.HS-PS3-5

A point charge  $-Q$  is placed a distance  $d$  from another point charge  $+2Q$ . How much work was required to place the negative charge at this location?

•  $-\frac{1}{4\pi\epsilon_0}\frac{Q}{d}$  

•  $\frac{1}{4\pi\epsilon_0}\frac{2Q}{d}$  

•  $-\frac{1}{4\pi\epsilon_0}\ \frac{2Q^2}{d}$  

•  $\frac{1}{4\pi\epsilon_0}\frac{2Q^2}{d}$  

How much potential energy is stored in a system of charges that consists of 3 charges, each with charge $+Q$  placed at the corners of an equilateral triangle of side length  $d$ ? 

•  $\frac{1}{4\pi\epsilon_0}\ \frac{Q}{d}$  

•  $\frac{1}{4\pi\epsilon_0}\ \frac{2Q}{d}$  

•  $\frac{1}{4\pi\epsilon_0}\ \frac{3Q}{d}$  

•  $\frac{1}{4\pi\epsilon_0}\ \frac{4Q}{d}$  

A positive charge  $+Q$  is placed a distance  $d$  from a negative charge  $-Q$ . Note these charges have the same magnitude but different sign. Which of the following is true about the electric field and the electric potential at a point midway between the two charges? 

• The electric field is zero and the electric potential is zero

• The electric field is not zero and the electric potential is zero

• The electric field is zero and the electric potential is not zero

• The electric field is not zero and the electric potential is not zero

Tags

NGSS.HS-PS2-4

NGSS.HS-PS3-5