KVPY SA Exam 2013 Question Paper

Question : 30 of 80

Marks: +1, -0

An electron enters a chamber in which a uniform magnetic field is present as shown.

An electric field of appropriate magnitude is also applied so that the electron travels undeviated without any change in its speed through the chamber. We are ignoring gravity. Then, the direction of the electric field is

opposite to the direction of the magnetic field
opposite to the direction of the electron’s motion
normal to the plane of the paper and coming out of the plane of the paper
normal to the plane of the paper and into the plane of the paper

Validate

Solution:

\q\E↖{→}+\q(\V↖{→}×\B↖{→})=0

Hence, into the paper

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