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Chapter 4: Q36E (page 715)

Two point charges Q and +q (where q is positive) produce the net electric field shown at point P in Fig. The field points parallel to the line connecting the two charges. (a) What can you conclude about the sign and magnitude of Q? Explain your reasoning. (b) If the lower charge were negative instead, would it be possible for the field to have the direction shown in the figure? Explain your reasoning.

Short Answer

Expert verified

Q is negative and magnitude is zero

No, it鈥檚 not possible

Step by step solution

01

Definition of electric field

When charge is present in any form, a point in space has an electric field that is connected to it. The value of E, often known as the electric field strength, electric field intensity, or just the electric field, expresses the strength and direction of the electric field.

02

Find the charge on Q

(a)

Since the net filed is in vertical direction that horizontal component of fields must be zero so the charge Q must be zero.

Hence, q is negative and magnitude is zero

03

Find the possibility

(b)

No, the electric field component of p in horizontal direction will be in the same direction as Q so the horizontal component will exist and for that p must not be negative, more over the direction of vertical component will depend on value of Q and p so we won鈥檛 make sure the exact direction.

Hence, no it鈥檚 not possible

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