An electron is moving along positive x−axis. To get it moving on an anticlockwise circular path in x−y plane, a magnetic field is applied
along positive y−axis
along positive z−axis
along negative y−axis
along negative z−axis
A
along positive y−axis
B
along positive z−axis
C
along negative y−axis
D
along negative z−axis
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Solution
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For the particle to move anti-clockwise, force should be in ^j direction.
→F=−e(→v×→B)=−e(v^i×→B)
⇒→B=B^k since LHS is in ^j direction.
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