A few electric field lines for a system of two charges $Q_{1}$ and $Q_{2}$ fixed at two different points on the $x$ -axis are shown in the figure. These lines suggest that [2010]

Question

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(1, 4)

Clearly from the figure, electric field lines are originating from $Q_{1}$ and terminating on $Q_{2}$ .

$∴$ $Q_{1}$ is positive and $Q_{2}$ is negative.

Number of electric field lines originating from $Q_{1}$ is more than terminating at $Q_{2}$ .

$∴$ $| Q_{1} |$ $>$ $| Q_{2} |$

Since at a finite distance to the right of $Q_{2}$ , the electric field is zero. The electric field created by $Q_{2}$ at a particular point will cancel out the electric field created by $Q_{1}$ . But at a finite distance to the left of $Q_{1}$ the electric field is non-zero.

Solution

Q.
A few electric field lines for a system of two charges $Q_{1}$ and $Q_{2}$ fixed at two different points on the $x$ -axis are shown in the figure. These lines suggest that [2010]

1 $| Q_{1} |$ $>$ $| Q_{2} |$

2 $| Q_{1} |$ $<$ $| Q_{2} |$

3 At a finite distance to the left of $Q_{1}$ , the electric field is zero.

4 At a finite distance to the right of $Q_{2}$ , the electric field is zero.

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Solution

Q. A few electric field lines for a system of two charges Q1 and Q2 fixed at two different points on the x-axis are shown in the figure. These lines suggest that [2010]

1 |Q1|>|Q2|

2 |Q1|<|Q2|

3 At a finite distance to the left of Q1, the electric field is zero.