AP EAPCET 2025 - 21st May Morning Shift | Moving Charges and Magnetism Question 20 | Physics

A velocity selector is to be constructed to select ions with a velocity of $6 \mathrm{~km} \mathrm{~s}^{-1}$. If the electric field used is $400 \mathrm{~V} \mathrm{~m}^{-1}$, then the magnetic field to be used is

$\frac{11}{20} T$

$\frac{2}{3} T$

$\frac{1}{15} \mathrm{~T}$

$\frac{2}{15} \mathrm{~T}$

AP EAPCET 2025 - 21st May Morning Shift

MCQ (Single Correct Answer)

-0

A closely wound solenoid of 1200 turns and area of cross-section $5 \mathrm{~cm}^2$ carries a current. If the magnetic moment of the solenoid is $1.2 \mathrm{JT}^{-1}$, then the current through the solenoid is

2.5 A

2 A

3 A

1.5 A

AP EAPCET 2024 - 23th May Morning Shift

MCQ (Single Correct Answer)

-0

A charge $q$ is spread uniformly over an isolated ring $R$. The ring is rotated about its natural axis with angular speed $\omega$. The magnetic dipole moment of the ring is

$\frac{q \omega R}{2}$

$q \omega R^2$

$\frac{q w R^2}{2}$

$\frac{q \omega}{2 R}$

AP EAPCET 2024 - 22th May Evening Shift

MCQ (Single Correct Answer)

-0

Current flows in a conductor from east to west. The direction of the magnetic field at a point below the conductor is towards

north

south

east

west

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