E must be into the ground, as E is the direction a + test charge would go. A negative charge would to up, which is the case.
Eq=mg
solve for E
then if q is increased by 4x, the net accelerating force is 3E (qQriginal), and that equals m a solve for a. A of course is upwards.
An object (with charge -4.2 µC and mass 0.024 kg) hovers at rest above the ground, its weight being held up by a uniform electric field.(a) Find the size and direction of this electric field.(b) If the electric charge on the object is quadrupled while its mass remains the same, find the size and direction of its acceleration.
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