An electric field can exist solely due to a source charge. An electric force requires at least two charges, the source charge to set up the field and the test charge to feel the field.

A. TRUE
B. FALSE

The electric field between square plates of a parallel-plate capacitor has magnitude e. the potential across the plates is maintained with constant voltage by a battery as they are pulled apart to twice their original separation, which is small compared to the dimensions of the plates. the magnitude of the electric field between the plates is now equal to a)e b)e/4 c)e/2 d)4e e)2e

Frequency of electromagnetic waves that a radio station is assigned is called

Resistivity of a material is the resistance of a cm long sample of the material of 1 cm2 cross-sectional area.