Ask Questions, Get Answers

Want to ask us a question? Click here
Browse Questions
Home  >>  JEEMAIN and AIPMT  >>  Physics  >>  Class12  >>  Magnetism and Matter
0 votes

An electron is moving along positive $ x$-axis. A uniform electric field exists along negative $y$-axis. What should be the direction of the magnetic field (constant) so that the force on the electron is zero?

$\begin {array} {1 1} (a)\;Positive \: y-axis & \quad (b)\;Negative\: y-axis \\ (c)\;Positive \: z-axis & \quad (d)\;Negative \: z-axis \end {array}$

Can you answer this question?

1 Answer

0 votes
The direction of the magnetic force must be opposite to the direction of the electric force.
$ -\hat k \times \hat i = -\hat j$ that is if the magnetic field is in the negetive Z axis it will produce a force in th enegetive Y axis which opposes the force due to the electric field
Ans : (d)


answered Feb 19, 2014 by thanvigandhi_1
edited Sep 11, 2014 by thagee.vedartham

Related questions

Ask Question
student study plans
JEE MAIN, CBSE, NEET Mobile and Tablet App
The ultimate mobile app to help you crack your examinations
Get the Android App