Two charges +5μC and +20μC are placed 15 cm apart. At
what point on the line joining the two charges is the electric
field zero?
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That means that along the line connecting the charges, the left charge contributes a rightward electric field, and the right charge contributes a leftward electric field. They are equidistant so they both have magnitude E=kqr2. There is no zero-field point for a pair of equal-magnitude-but-opposite-sign charges.
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