JEE PHYSICS UNIT 13
QUIZ NO 2
TOTAL QUESTIONS = 20
1. A proton and a deuteron having the same kinetic energy enter a region of uniform magnetic field perpendicular to their velocities. The ratio of the radii of their circular paths is
A. 1:1
B. √2:1
C. 1:√2
D. 2:1
2. A long straight wire of radius a carries a steady current I. The current is uniformly distributed across its cross-section. The ratio of the magnetic field at a/2 to that at a is
A. 1:2
B. 1:4
C. 1:1
D. 2:1
3. An electron is projected with uniform velocity along the axis inside a current-carrying long solenoid. The force on the electron is
A. Along the axis
B. Perpendicular to the axis
C. Centripetal
D. Zero
4. A charged particle moving in a magnetic field experiences a force. This force is maximum when the angle between the velocity of the particle and the magnetic field is
A. 0°
B. 45°
C. 90°
D. 180°
5. The magnetic field at the center of a circular loop of radius R carrying current I is
A. μ₀I/2R
B. μ₀I/4πR
C. μ₀I/2πR
D. μ₀I/R
6. A current-carrying loop is placed in a uniform magnetic field. The torque acting on it is maximum when the plane of the loop is
A. Parallel to the field
B. Perpendicular to the field
C. At 45° to the field
D. At 30° to the field
7. A long straight conductor with a semicircular arc of radius R carries a current I. The magnetic field at the center of the arc is
A. μ₀I/4R
B. μ₀I/2R
C. μ₀I/R
D. Zero
8. Two parallel wires carrying currents in the same direction attract each other due to
A. Magnetic interaction
B. Electric interaction
C. Gravitational interaction
D. None of the above
9. A charged particle enters a uniform magnetic field with its velocity perpendicular to the field. Its path will be
A. Straight line
B. Circle
C. Helix
D. Parabola
10. The magnetic moment of a current-carrying circular loop is proportional to
A. Radius of the loop
B. Square of the radius
C. Current
D. Both B and C
11. A solenoid of length L and N turns carries a current I. The magnetic field inside the solenoid is
A. μ₀NI/L
B. μ₀NIL
C. μ₀I/L
D. μ₀N²I/L
12. The force per unit length between two parallel current-carrying conductors separated by a distance d is
A. μ₀I₁I₂/2πd
B. μ₀I₁I₂/4πd
C. μ₀I₁I₂/2πd²
D. μ₀I₁I₂/4πd²
13. A rectangular loop of wire carrying a current I is placed in a uniform magnetic field B. The torque acting on the loop is given by
A. IAB
B. IAB sinθ
C. IAB cosθ
D. IAB tanθ
14. The magnetic field due to a small current element is given by
A. Ampere's law
B. Biot-Savart law
C. Faraday's law
D. Lenz's law
15. A proton moving with a constant velocity passes through a region of space without any change in its velocity. If E and B represent electric and magnetic fields, respectively, this implies that
A. E = 0, B = 0
B. E ≠ 0, B = 0
C. E = 0, B ≠ 0
D. E = vB
16. A circular loop of radius R carries a current I. The magnetic field at a point on the axis of the loop at a distance x from the center is proportional to
A. x
B. 1/x
C. 1/(x² + R²)^(3/2)
D. 1/(x² + R²)^(1/2)
17. A long straight wire carries a current I. The magnetic field at a distance r from the wire is
A. μ₀I/2πr
B. μ₀I/4πr
C. μ₀I/2πr²
D. μ₀I/4πr²
18. A charged particle moves in a circular path in a uniform magnetic field. The frequency of revolution is independent of
A. Magnetic field
B. Velocity of the particle
C. Mass of the particle
D. Charge of the particle
19. The magnetic flux through a surface is maximum when the angle between the magnetic field and the normal to the surface is
A. 0°
B. 45°
C. 90°
D. 180°
20. A current-carrying conductor is placed in a magnetic field. The maximum force is experienced when the angle between the conductor and the magnetic field is
A. 0°
B. 45°
C. 90°
D. 180°
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