COMEDK 2023 Morning Shift | Moving Charges and Magnetism Question 1 | Physics

Two very long straight parallel wires carry currents $$i$$ and $$2 i$$ in opposite directions. The distance between the wires is $$r$$. At a certain instant of time a point charge $$q$$ is at. a point equidistant from the two wires in the plane of the wires. Its instantaneous velocity $$v$$ is perpendicular to this plane. The magnitude of the force due to the magnetic field acting on the charge at this instant is

zero

$$\frac{3 \mu_0}{2 \pi} \frac{i q v}{r}$$

$$\frac{\mu_0}{\pi} \frac{i q v}{r}$$

$$\frac{\mu_0}{2 \pi} \frac{i q v}{r}$$

COMEDK 2023 Morning Shift

MCQ (Single Correct Answer)

-0

A straight wire of length $$2 \mathrm{~m}$$ carries a current of $$10 \mathrm{~A}$$. If this wire is placed in uniform magnetic field of $$0.15 \mathrm{~T}$$ making an angle of $$45^{\circ}$$ with the magnetic field, the applied force on the wire will be

$$1.5 \mathrm{~N}$$

$$3 \mathrm{~N}$$

$$3 \sqrt{2} \mathrm{~N}$$

$$3 / \sqrt{2} \mathrm{~N}$$

COMEDK 2023 Morning Shift

MCQ (Single Correct Answer)

-0

A square wire of each side l carries a current $$I$$. The magnetic field at the mid-point of the square

COMEDK 2023 Morning Shift Physics - Moving Charges and Magnetism Question 5 English

$$4 \sqrt{2} \frac{\mu_0}{4 \pi} \frac{I}{l}$$

$$8 \sqrt{2} \frac{\mu_0}{4 \pi} \frac{I}{l}$$

$$16 \sqrt{2} \frac{\mu_0}{4 \pi} \frac{I}{l}$$

$$32 \sqrt{2} \frac{\mu_0}{4 \pi} \frac{I}{l}$$

COMEDK 2023 Evening Shift

MCQ (Single Correct Answer)

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A magnetic field does not interact with:

An electric charge at rest.

A moving electric charge

A current carrying straight conductor

A moving permanent magnet

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