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Question

Following figure shows the path of an electron that passes through two regions containing uniform magnetic fields of magnitudes B1 and B2. It's path in each region is a half circle, choose the correct option
1364773_1f48f9c7080548da9f6ba00946aca5cf.png

A
B1 is into the page it is stronger than B2
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B
B1 is to the page it is weaker than B2
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C
B1 is out of the page it is weaker than B2
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D
B1 is out the page it is stronger than B2
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Solution

The correct option is B B1 is into the page it is stronger than B2
Solution:
For a charged particle in a magnetic field,
r1B
If r1<r2, then B1>B2

On a charged particle,
F=q(v×B)

B1 is in the page
B1 is into the page it is stronger than B2

Hence A is the correct option

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