Coulomb’s Law Vector Notation Quiz

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Which scientist named the charges on objects as positive and negative?

Benjamin Franklin (correct)

Thomas Edison

Isaac Newton

Albert Einstein

What object is conventionally referred to as having a positive charge?

Glass rod (correct)

Aluminum foil

Copper wire

Plastic rod

Why do the charges acquired by objects neutralize each other's effects when brought in contact?

To increase their charge

To reduce their stability

To attract other charged objects

To nullify each other's effect (correct)

Which apparatus is commonly used to detect charge on a body?

Gold-leaf electroscope Signup and view all the answers

How do the gold leaves in a gold-leaf electroscope behave when a charged object touches the metal knob?

They diverge Signup and view all the answers

What is the term used to describe a body with no electric charge?

Neutral Signup and view all the answers

What is the value of ε0 in SI units?

8.854 × 10^12 C^2 N^-1m^-2 Signup and view all the answers

Which vector denotes the position leading from charge q1 to q2?

r21 Signup and view all the answers

If charges q1 and q2 are of the same sign, what does F21 denote?

Repulsion Signup and view all the answers

In Coulomb's law, what does F21 represent?

Force on q1 due to q2 Signup and view all the answers

If charges q1 and q2 are of opposite signs, what does F21 denote?

Attraction Signup and view all the answers

How is the direction of a vector specified?

By a unit vector along the vector Signup and view all the answers

What is the acceleration that an electron undergoes under the action of Coulomb force?

2.5 x 10^22 m/s^2 Signup and view all the answers

What is the acceleration of the proton under the action of Coulomb force?

1.4 x 10^19 m/s^2 Signup and view all the answers

What is the magnitude of force between the charged metallic spheres A and B in the given scenario?

4πε0r^2 Signup and view all the answers

What is the expected repulsion of sphere A on the basis of Coulomb's law after touching sphere C?

Half of the initial repulsion Signup and view all the answers

What is the distance between spheres A and B after B is brought closer to A to a distance of 5.0 cm from the initial distance of 10 cm?

2.5 cm Signup and view all the answers

What effect does touching uncharged sphere D have on sphere B before it is brought closer to A?

Neutralizes the charge on sphere B Signup and view all the answers

What is the direction of the electric field when using the formula for dipole field at a point on the normal to the axis of the dipole?

Opposite to the direction of the dipole moment vector Signup and view all the answers

What is the result when a permanent dipole is placed in a uniform external field?

Net force on the dipole is zero Signup and view all the answers

What is true about the torque on a dipole in a uniform electric field?

Depends on the origin point Signup and view all the answers

In what direction is the torque on a dipole in a uniform electric field?

Normal to the plane of the paper Signup and view all the answers

What is the relation between p, E, and q in determining the magnitude of torque on a dipole?

$2qaEsinq$ Signup and view all the answers

How does p x E relate to determining the direction of torque on a dipole in a uniform electric field?

Normal to the paper Signup and view all the answers

What type of device did Coulomb use to measure the force between two charged metallic spheres?

Torsion balance Signup and view all the answers

How did Coulomb approximate the charged spheres when the separation between them was much larger than their radii?

As point charges Signup and view all the answers

What assumption was implicit in Coulomb's experiments with charges?

Additivity of charges and conservation Signup and view all the answers

What charge did Coulomb assume on a metallic sphere to begin with?

$q$ Signup and view all the answers

In Coulomb's experiments, how did he determine the charge on each metallic sphere after putting them in contact with each other?

$rac{q}{2}$ Signup and view all the answers

Why did Coulomb vary the distance between charged spheres in his experiments?

To measure the force for different separations Signup and view all the answers