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EAMCET Engineering 2010 Solved Paper

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Question : 107

Total: 160

In Thomson's experiment to determine ‌

of an electron, it is found that an electron beam having a kinetic energy of 45.5‌eV remains undeflected, when subjected to crossed electric and magnetic fields. If E=1×103Vm−1, the value of B is (mass of the electron is 9.1×10−31‌kg )

2.5×10−3‌Wb‌m−2
5.0×10−4‌Wb‌m−2
2.5×10−4‌Wb‌m−2
1.0×10−4‌Wb‌m−2

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