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JEE Advanced Model Paper 5 with solutions for online practice

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Question : 4

Total: 54

A charged particle having specific charge β moves as a conical pendulum of length l making an angle θ with thevertical and maintaining a constant angular velocity ω, in the presence of a uniform magnetic field B is directedvertically downward as shown in figure, then

Magnitude of magnetic field is
1
β
(ω−
g
ωlcosθ
)
Magnitude of angular momentum of the particle about the point of suspension remains constant
Magnitude of magnetic field is
1
β
(ω+
g
ωlcosθ
)
Rate of change of angular momentum of the particle about the axis of rotation is not a constant vector

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