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Moving Charges and Magnetism Set-1 MCQ Online Practice Test | Class 12 | Quiz Tweek

Moving Charges and Magnetism Set-1

Practice Important MCQs for Moving Charges and Magnetism — Physics, Class 12.

The chapter "Moving Charges and Magnetism" is a cornerstone of Electromagnetism in the Class 12 Physics syllabus. It bridges the gap between static electricity and magnetism, explaining how moving charges generate magnetic fields and how these fields, in turn, exert forces on other moving charges and currents. For CBSE board exams, this chapter carries significant weightage, often featuring a mix of conceptual MCQs, derivation-based questions, and numerical problems related to the Biot-Savart Law and Ampere’s Circuital Law.

Mastering this chapter is essential for understanding advanced topics like Electromagnetic Induction and Alternating Currents. Students should focus on the vector nature of magnetic forces, the motion of charged particles in uniform magnetic fields, and the functional principles of the Moving Coil Galvanometer. This practice set is designed to test your proficiency in these areas, aligning strictly with the NCERT curriculum and the 2024-25 CBSE examination pattern.

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Q1. A charged particle is moving through a uniform magnetic field. Which of the following quantities of the particle will NOT change?

(A)

Velocity

(B)

Momentum

(C)

Kinetic Energy

(D)

Acceleration

Q2. The magnetic field at the center of a circular current-carrying loop of radius $R$ is $B$ . What will be the magnetic field at the center if the radius is doubled and the current is halved?

(A)

$B/4$

(B)

$B/2$

(C)

$2B$

(D)

$4B$

Q3. According to the Biot-Savart law, the magnetic field $d\vec{B}$ due to a current element $Id\vec{l}$ at a distance $\vec{r}$ is proportional to:

(A)

$\frac{d\vec{l} \times \vec{r}}{r}$

(B)

$\frac{d\vec{l} \cdot \vec{r}}{r^3}$

(C)

$\frac{d\vec{l} \times \vec{r}}{r^3}$

(D)

$\frac{d\vec{l} \times \vec{r}}{r^2}$

Q4. A proton and an alpha particle enter a uniform magnetic field with the same velocity perpendicular to the field. The ratio of the radii of their circular paths $r_p : r_\alpha$ is:

(A)

1 : 2

(B)

2 : 1

(C)

1 : 1

(D)

1 : 4

Q5. Two long parallel wires carrying currents in the same direction will:

(A)

Repel each other

(B)

Attract each other

(C)

Neither attract nor repel

(D)

Rotate each other

Q6. The S.I. unit of magnetic permeability $\mu_0$ is:

(A)

$T \cdot m \cdot A^{-1}$

(B)

$T \cdot m^{-1} \cdot A$

(C)

$T \cdot m \cdot A$

(D)

$T \cdot A \cdot m^{-2}$

Q7. A solenoid of length $0.5$ m and radius $1$ cm has $500$ turns. If a current of $5$ A flows through it, the magnetic field inside the solenoid is:

(A)

$6.28 \times 10^{-3}$ T

(B)

$3.14 \times 10^{-3}$ T

(C)

$6.28 \times 10^{-5}$ T

(D)

$2.15 \times 10^{-2}$ T

Q8. A current-carrying loop placed in a uniform magnetic field experiences a maximum torque when the angle between the area vector and the magnetic field is:

(A)

$0^\circ$

(B)

$45^\circ$

(C)

$90^\circ$

(D)

$180^\circ$

Q9. The sensitivity of a moving coil galvanometer can be increased by:

(A)

Decreasing the number of turns

(B)

Decreasing the area of the coil

(C)

Increasing the magnetic field

(D)

Increasing the torsional constant of the spring

Q10. To convert a galvanometer of resistance $G$ into an ammeter of range $nI_g$ , the required shunt resistance $S$ is:

(A)

$G/(n-1)$

(B)

$G/n$

(C)

$G(n-1)$

(D)

$nG$

Q11. An electron is moving north in a region where the magnetic field is directed vertically upward. The magnetic force on the electron is directed towards:

(A)

East

(B)

West

(C)

South

(D)

North

Q12. The magnetic field at a distance $r$ from a long straight wire carrying current $I$ varies as:

(A)

$1/r^2$

(B)

$1/r$

(C)

$r$

(D)

$r^2$

Q13. A current $I$ flows through a square loop of side $1/r^2$ . The magnetic field at the center of the loop is:

(A)

$\frac{\mu_0 I}{2\pi L}$

(B)

$\frac{2\sqrt{2} \mu_0 I}{\pi L}$

(C)

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

(D)

$\frac{\mu_0 I}{\sqrt{2}\pi L}$

Q14. If the speed of a charged particle moving in a magnetic field is doubled, then the period of revolution:

(A)

Is doubled

(B)

Is halved

(C)

Remains the same

(D)

Becomes four times

Q15. The magnetic dipole moment of a current-carrying coil does NOT depend on:

(A)

Number of turns

(B)

Current

(C)

Area of the coil

(D)

Magnetic field in which it is kept

...and 15 more challenging questions available in the interactive simulator.

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