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Question (11)

QN0039020

An electron (mass , charge ) moving with a velocity of enters a magnetic field. If it describes a circle of radius , then strength of magnetic field must be

(A)
(B)
(C)
(D)

Correct Answer: C

Explanation:

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Question (12)

QN0039021

A proton and a deuterium nucleus having certain kinetic energies enter in a uniform magnetic field with same component of velocity in the direction of magnetic field. Which of the following is correct?

(A)
Proton has greater pitch of helical motion.
(B)
Deuterium nucleus has greater pitch of helical motion.
(C)
Both particles have same pitch of helical motion.
(D)
Which particle has greater pitch depends on the fact that which particle has greater component of velocity perpendicular to magnetic field. Element, Biot Savart's Law

Correct Answer: B

Explanation:

Due to perpendicular component both will execute circular motion for which . Since is same, therefore . Hence deuterium nucleus will travel more distance.

(b) i.e. both

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