Asmall object of mass 4.10 g and charge −18.4 μc is suspended motionless above the ground when immersed in a uniform electric field perpendicular to the ground. what are the magnitude and direction of the electric field?

force due to electric field is balanced by the force due to its own weight

here

m = 4.10 g

now from the above equation we will have

its direction is downwards along the direction of gravity as its a negative charge given here.

b.transmitters send radio waves, and receivers capture radio waves.

grav forces affect all objects magnetic forces affect magnetic objects and electric currents