Statement $(I)$: $A$ uniform electric field and a uniform magnetic field are pointed in the same direction. If an electron is projected in the same direction, the electron velocity will decrease in magnitude.
Statement $(II)$: Two infinitely long parallel wires are carrying current in the same direction. The magnetic field at a point midway between the wires is zero.
Statement $(III)$: No net force acts on a rectangular coil carrying a steady current when suspended in a uniform magnetic field.
Which of the following is correct?

  • A
    Statements $I$, $II$ and $III$ are true.
  • B
    Statements $I$ and $II$ are true, but statement $III$ is false.
  • C
    Statements $II$ and $III$ are true, but statement $I$ is false.
  • D
    Statements $I$ and $III$ are true, but statement $II$ is false.

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$(III)$ Proton with $\overrightarrow{v}=0$$(iii)$ $\overrightarrow{E}=-E_0 \hat{x}$$(R)$ $\overrightarrow{B}=B_0 \hat{y}$
$(IV)$ Proton with $\overrightarrow{v}=2 \frac{E_0}{B_0} \hat{x}$$(iv)$ $\overrightarrow{E}=E_0 \hat{x}$$(S)$ $\overrightarrow{B}=B_0 \hat{z}$

$(1)$ In which case will the particle move in a straight line with constant velocity?
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