Electrostatics

The electric potential at a distance of 4 m from a certain point charge is 200 V relative to infinity. What is the potential (relative to infinity) at a distance of 2 m from the same charge?

• 600 V
• 50 V
• 200 V
• 400 V

Tags

NGSS.HS-PS2-4

A region of space contains a uniform electric field, directed toward the right, as shown in the figure. Which statement about this situation is correct?

• The potential at point A is the highest, the potential at point B is the second highest, and the potential at point C is the lowest.
• The potential at points A and B are equal, and the potential at point C is lower than the potential at point A.
• The potential at all three locations is the same.
• The potentials at points A and B are equal, and the potential at point C is higher than the potential at point A.

Tags

NGSS.HS-PS2-4

NGSS.HS-PS3-5

Two protons are released from rest, with only the electrostatic force acting. Which of the following statements  is NOT true about them as they move apart? 

• Their electric potential energy keeps decreasing.
• Their electric potential energy keeps increasing.
• Their acceleration keeps decreasing.
• Their kinetic energy keeps increasing.

Tags

NGSS.HS-PS2-4

NGSS.HS-PS3-2

NGSS.HS-PS3-5

How much work must we do on an electron to move it from point A, which is at a potential of +50V, to point B, which is at a potential of -50 V, along the semicircular path shown in the figure? Assume the system is isolated from outside forces. (e = 1.60 × 10^-19 C)

• 1.60 × 10^-17 J
• -1.6 J
• 1.6 J
• -1.60 × 10^-17 J

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-5

A and B are two conducting spheres of the same radius A being solid and B hollow, both have same charge. What will be the relation between their electric fields inside the two spheres at depth of half of their radius?

• E_A=E_B

• E_A=2E_B

• 2E_A=E_B

• E_A=KQ/r² ;E_B=0

What is the electrostatic potential at equatorial point of a dipole?

• twice of the axial point

• half of the axial point

• zero

• not defined

Why must electrostatic field at the surface of a charged conductor be normal to the surface at every point?

• As electric field inside conductor is always zero

• If not normal than it will have component parallel to the surface and perpendicular to the surface

• parallel component of the field will generate current along the surface, which is not possible

• work done in moving the charge along the surface ha to be zero

Two charges – q and + q are located at points A (0, 0, -a) and B (0, 0, +a) respectively. How much work is done in moving a test charge 2 µC from point P (7, 0, 0) to Q (-3, 0, 0)?

• $\frac{Kq^2}{100}$

• $\frac{Kq^2}{16}$

• $\frac{Kq^2}{10}$

• zero

Tags

NGSS.HS-PS2-4

NGSS.HS-PS3-5

A test charge q is moved without acceleration from A to C along the path from A to B and then B to C in electric field E as shown in the figure. At which point of the three is the electric potential more ?

• A

• B

• C

• All are at same potential

Relation between the electric field and the electrostatic force due to a source charge Q at a point 'r' distance away from the charge on test charge q₀ is

• F=Eq₀

• F=E/Q

• F=E/q₀

• F=EQ

Tags

NGSS.HS-PS2-4