_CH 21 sec 1 worksheet AK gr 11 tr2 w 4 and 5

Part A: Multiple Choice

• Electric Field Forces: An electric field produces forces that can: do work.

• Direction of the Force on a Positive Test Charge: They are in the same direction.

• Purpose of a Test Charge: A test charge is used to: measure.

• Electric Field Lines: Which is not true about electric field lines? They can not cross each other.

• Uses of Electric Field Lines: They are used to determine the strength of an electric field.

• Direction of Electric Field: It is the same as the direction of the force on a positive test charge.

• Electric Field Lines and Strength: Electric field lines provide a picture of an electric field.

• Inverse Square Law: Both gravitational and electric forces vary inversely as the square of the distance.

• Field Around Charged Objects: A/An electric field exists around any charged object.

Part B: Complete

• Electric Field Definition: Electric field is the property of space around a charged object that exerts a force on other charged objects.

• Electric Field Lines: They provide a picture of the size and strength of the field around a charged object.

Part C: True or False

• Force Direction on Positive Test Charge: True (like charges repel).

• Existence of Field Lines: True (they are a model of an electric field).

• Crossing Electric Field Lines: True (electric field lines never cross).

• Line Density and Field Strength: True (more lines indicate a stronger electric field).

Part D: Short Answer

• Electric Field Strength Equation: Write the equation for electric field strength and explain the variables.

• Test Charge Size: Needs to be small to not affect the electric field.

• Coulomb’s Law Conditions: Valid for point charges and uniformly charged spheres.

• Electric Field Lines and Strength: Show direction of force on a positive test charge, with closeness indicating strength.

Part E: Diagram Descriptions

• Electric Field Lines for Charges: Field lines form from the positive to negative charge for unlike charges and spread away for like charges.

Part F: Electric Field Strength and Detection

• Magnitude of Electric Field: Calculate at a distance of 0.40 m from +6.0×10−6 C.

• Measuring Electric Field: Place a test charge and check for force; the strength is force divided by test charge magnitude.

• Existence of Field Lines and Electric Fields: Field lines are models; electric fields exist.

• Calculating Electric Field: For a test charge of 2.40×10−8 C experiencing 1.50×10−3 N: E = F / q' = 6.25×10^4 N/C (east).

• Electric Field vs. Force: The electric field is a property of space, while the force depends on the test charge's magnitude and sign.