Field Intensity and Distance
How electric-field strength changes with distance from a charge
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Teachers - Need to use your overhead? Field Intensity
Show Me The Physics
Charging Pith balls. Explain this.
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Review Name these charges
A is negative B is positive
Fill in the Blank Notes
H) Field Intensity and
Distance
1) Spherical point charge
Field intensity varies
Inverse Square Law Animation Double distance from spherical charge, the field intensity ....
is quartered
2. Charged Rod - the field intensity varies inversely with distance
If the distance to the rod is
reduced to 1/3 its original distance,
would be 3 times greater
Electric Field Strength and Distance
Show Me The Physics Website
Review - Can you explain this?
Review - Name these charges
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Check Your Understanding
5 quick questions — pick an answer to see if you’re right.
1. For a spherical point charge, how does field intensity vary with distance?
2. You move twice as far from a spherical point charge. The field intensity is
3. The field is 36 N/C at some distance from a point charge. What is it at three times that distance?
4. For a long charged rod, the distance to the rod is reduced to ⅓. What happens to the field intensity?
5. A student says doubling your distance from a long charged rod makes the field ¼ as strong. What is correct?