20/23 4DSF14b - "PRACTICE FOR SUCCESS" P4S_1

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An attractive force exists between

• A. Two neutrons
• B. An electron and a neutron
• C. An electron and a proton
• D. Two protons

The electric field strength at a point is the

• A. work done to bring a proton from infinity to the point
• B. electrostatic force that acts on a unit of positive test charge at the point
• C. electric potential of charge per unit square of distance at the point
• D. electric potential energy to bring a unit of positive test charge from infinity to the point

In the diagram below, P is a point near a positively charged sphere. Which direction best represents the direction of the electric field at point P?

• A. To the right
• B. To the left
• C. Upwards
• D. Downwards

Which of the following statements about the equipotential lines and surfaces is CORRECT?

• The locus of points that have the same electric potential energy.
• The locus of points that have the same electric potential.
• The locus of points that have the same electric charge.
• The locus of points that have the same electric field strength.

The work done in moving a positive charge from one point to another in an equipotential surface is

• A. always negative value
• B. always positive value
• C. equal to zero
• D. none of the above

The electric potential is defined as

• A. the work done per unit potential difference.
• B. the locus of points that have the same electric potential.
• C. the work done per unit charge in bringing a positive test charge from a point to another point in the electric field.
• D. the work done per unit charge in bringing positive test charge from infinity to that point in the electric field.

In a parallel-plate capacitor, how can the capacitance be decreased?

• A. Decreased the cross-sectional area
• B. Increased the plate separation
• C. Insert dielectric
• D. Decreased the stored charge

___________ is a measure of how quickly the capacitor is charged or discharged.

• A. Capacitance
• B. Time constant
• C. Electromotive force
• D. Resistance