A) remains constant.
B) increases with time.
C) decreases with time.
D) increases and decreases periodically.
Correct Answer: A
Solution :
Option [a] is correct. |
Explanation: Given, \[v={{v}_{0}}\overset{}{\mathop{i}}\,\]and \[B={{B}_{0}}\overset{}{\mathop{j}}\,\] Magnetic force on moving electron\[=-e[{{v}_{0}}i\times {{B}_{0}}j]=-e{{v}_{0}}{{B}_{0}}k\] |
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So, the force is perpendicular to v and B both as the force is perpendicular to the velocity. So, the magnitude will not change v or mv \[(p=mv\ \operatorname{momentum})\]so, the de-Broglie wavelength remains same. |
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