(a) In a region of a uniform electric field $\vec{\text{E}}$, a negatively charged particle is moving with a constant velocity $\vec{v} = -v_0 \hat{i}$ near a long straight conductor coinciding with $\text{XX}'$ axis and carrying current $\text{I}$ towards $-\text{X}$ axis. The particle remains at a distance d from the conductor. (i) Draw diagram showing direction of electric and magnetic fields. (ii) What are the various forces acting on the charged particle ? (iii) Find the value of $v_0$ in terms of $\text{E}$, d and $\text{I}$. OR (b) Two infinitely long conductors kept along $\text{XX}'$ and $\text{YY}'$ axes are carrying current $\text{I}_1$ and $\text{I}_2$ along $-\text{X}$ axis and $-\text{Y}$ axis respectively. Find the magnitude and direction of the net magnetic field produced at point $\text{P(X, Y)}$.

Year	Paper Code	Set	Position
CBSE 2025	Series 55-2	Set 1	Question 23
CBSE 2025	Series 55-2	Set 2	Question 26
CBSE 2025	Series 55-2	Set 3	Question 27

• Step 1: Stating the fundamental formula / law statement (+1 Mark)
• Step 2: Intermediate mathematical substitution or proof steps (+1 Mark)
• Step 3: Correct final value or conclusion with mandatory SI units (+1 Mark)