The net force on the -4.0μC object as a result of this net field will be -10.4 N.
<h3>What is the charge?</h3>
The matter has an electric charge when it is exposed to an electromagnetic field is known as a charge.
The electric field intensity is found as the force per unit charge.
Electric field intensity on the positive charge:

Electric field intensity on the negative charge:

The net charge is the algebraic sum of the two charges;

Hence, as a result of this net field, the net force on the -4.0C object will be -10.4 N.
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The Definition of Work is given by:
Entering the unknowns, we have:

If you notice any mistake in my english, please let me know, because i am not native.
B altruism.
al·tru·ism
ˈaltro͞oˌizəm/Submit
noun
the belief in or practice of disinterested and selfless concern for the well-being of others
Changing the medium of the wave.
Waves is always determined by the properties of the medium, which means that changing the medium will change the velocity of the wave