-As shown in the figure, two infinitely long straight parallel wires $P$ and $Q$ carrying equal currents in…

-As shown in the figure, two infinitely long straight parallel wires $P$ and $Q$ carrying equal currents in opposite directions are arranged parallel to $\mathrm{Y}$-axis. If the magnetic field due to wire $\mathrm{P}$ at the origin ' $\mathrm{O}$ ' of the co-ordinate system is B, then match the resultant magnetic fields at various points given in column $A$ with the points given in column $B$. $\begin{array}{ll} \text{Column A} & \text{Column B} \\ \text{A)} \frac{B}{4} & \text{i)} (0,0) \\ \text{B)} \frac{B}{2} & \text{ii)} (a, 0) \\ \text{C)} \frac{2 \mathrm{~B}}{3} & \text{iii)} (2a, 0) \\ \text{D)} 2 \mathrm{~B} & \text{iv)} (3 \mathrm{a}, 0) \\ \end{array}$
The correct answer is

1. $\begin{array}{llll}\text { A } & \text { B } & \text { C } & \text { D } \\ \text { ii } & \text { iii } & \text { iv } & \text { i }\end{array}$
2. $\begin{array}{llll}\text { A } & \text { B } & \text { C } & \text { D } \\ \text { iv } & \text { ii } & \text { iii } & \text { i }\end{array}$
3. $\begin{array}{llll}\text { A } & \text { B } & \text { C } & \text { D } \\ \text { i } & \text { iii } & \text { ii } & \text { iv }\end{array}$
4. $\begin{array}{cccc}\text { A } & \text { B } & \text { C } & \text { D } \\ \text { iii } & \text { ii } & \text { i } & \text { iv }\end{array}$

Solution

Asked in: AP EAMCET 2017 (24 Apr Shift 2)

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