A uniform electric field and a uniform magnet | vedclass

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(D) The force on an electron due to an electric field is given by $\vec{F}_{E} = -e\vec{E}$.The force on an electron due to a magnetic field is given

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speed will decrease

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(D) The force on an electron due to an electric field is given by $\vec{F}_{E} = -e\vec{E}$.The force on an electron due to a magnetic field is given by $\vec{F}_{B} = -e(\vec{v} 	imes \vec{B})$.Since the velocity $\vec{v}$ and the magnetic field $\vec{B}$ are in the same direction,the angle between them is $0^{\circ}$. Therefore,$\vec{v} 	imes \vec{B} = 0$,which means $\vec{F}_{B} = 0$.The total force on the electron is $\vec{F} = \vec{F}_{E} + \vec{F}_{B} = -e\vec{E}$.Since the electric field $\vec{E}$ acts in the same direction as the velocity,the force $-e\vec{E}$ acts in the opposite direction to the velocity of the electron.Because the force is opposite to the direction of motion,the speed of the electron will decrease.

$A$ 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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