COMEDK 2024 Evening Shift | Moving Charges and Magnetism Question 1 | Physics

A current I flows in an infinitely long wire with cross section in the form of semi-circular ring of radius $$1 \mathrm{~m}$$. The magnitude of the magnetic induction along its axis is

$$\frac{\mu_0 \mathrm{I}}{2 \pi} \mathrm{T}$$

$$\frac{\mu_0 \mathrm{I}}{\pi^2} \mathrm{~T}$$

$$\frac{\mu_0 \mathrm{I}}{4 \pi^2} \mathrm{~T}$$

$$\frac{\mu_0 \mathrm{I}}{2 \pi^2} \mathrm{~T}$$

COMEDK 2024 Evening Shift

MCQ (Single Correct Answer)

-0

A negative charge particle is moving upward in a magnetic field which is towards north. The particle is deflected towards

North

South

East

West

COMEDK 2024 Evening Shift

MCQ (Single Correct Answer)

-0

A wire of length $$2 \mathrm{~m}$$ carries a current of $$1 \mathrm{~A}$$ along the $$\mathrm{x}$$ axis. A magnetic field $$B=B_0(i+j+k)$$ tesla exists in space. The magnitude of magnetic force on the wire is

2B$$_0$$ N

Zero

3B$$_0$$ N

2$$\sqrt2$$B$$_0$$ N

COMEDK 2024 Afternoon Shift

MCQ (Single Correct Answer)

-0

A long horizontal wire $$\mathrm{P}$$ carries current of $$50 \mathrm{~A}$$ from left to right. It is rigidly fixed. Another fine wire $$\mathrm{Q}$$ is placed directly above and parallel to $$\mathrm{P}$$. The mass of the wire is '$$\mathrm{m}$$' $$\mathrm{kg}$$ and carries a current of '$$\mathrm{I}$$' A. The direction of current in $$\mathrm{Q}$$ and position of wire $$\mathrm{Q}$$ from $$\mathrm{P}$$ so that the wire $$\mathrm{Q}$$ remains suspended are

$$ \text { Right to left, } \quad \frac{50 I \mu_0}{\pi m g} $$

$$ \text { Left to right, } \quad \frac{25 I \mu_0}{\pi m g} $$

$$ \text { Right to left, } \quad \frac{25 I \mu_0}{\pi m g} $$

$$ \text { Right to left, } \quad \frac{I \mu_0}{4 \pi m g} $$

COMEDK Subjects