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NEET 2011 (AIPMT, Prelims) · Moving Charge in a Magnetic Field

Moving Charge in a Magnetic Field question from NEET 2011 (AIPMT, Prelims)

Q107NEET 2011 · AIPMT · PRELIMSEasy

Moving Charge in a Magnetic Field

A uniform electric field and a uniform magnetic field are acting along the same direction in a certain region. If an electron is projected in the region such that its velocity is pointed along the direction of fields, then the electron

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Answer: (b)

$\vec v \parallel \vec B \Rightarrow$ magnetic force $-e(\vec v\times\vec B) = 0$ , so no turning.
Electric force on electron $= -e\vec E$ , opposite to $\vec E$ , i.e. opposite to $\vec v$ .
The electron is decelerated along its line of motion.
So the answer is (b) speed will decrease.

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