Moving Charges and Magnetism-Quiz-11

MOVING CHARGES AND MAGNETISM - 11

Dear Readers,

JEE Advanced Physics Syllabus can be referred by the IIT aspirants to get a detailed list of all topics that are important in cracking the entrance examination. JEE Advanced syllabus for Physics has been designed in such a way that it offers very practical and application-based learning to further make it easier for students to understand every concept or topic by correlating it with day-to-day experiences. In comparison to the other two subjects, the syllabus of JEE Advanced for physics is developed in such a way so as to test the deep understanding and application of concepts.

Q1. The magnetic field at the origin due to the current flowing in the wire is

•  -(μ_0 I)/8πa(i ̂+k ̂)
•  (μ_0 I)/2πa(i ̂+k ̂)
•  (μ_0 I)/8πa(-i ̂+k ̂)
•  (μ_0 I)/(4πa√2)(i ̂-k ̂)

Solution

Q2.A conductor AB of length L carrying a currentI^', is placed perpendicular to a long straight conductor XY carrying a currentI, as shown in figure. The force on AB has magnitude

•  (μ_0 I^' I)/2π log⁡2
•  (μ_0 I^' I)/2π log⁡3
•  (3μ_0 I^' I)/2π log⁡3/2
•  (2μ_0 I^' I)/3π

Solution

Q3.  A stream of electrons is projected horizontally to the right. A straight conductor carrying a current is supported parallel to the electron stream and above it. If the current in the conductor is from left to right, what will be the effect on the electron stream?

•  The electron stream will be pulled upward
•  The electron steam will be pulled downward
•  The electron stream will be retarded
•  The electron steam will be speeded up toward the right

Solution

Q4. Which of the field pattern given in the figure is valid for electric field as well as for magnetic field?

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Solution

Q5. A Q5.In figure ABCDEFA was a square loop of side l, but is folded in two equal parts so that half of it lies in the xz-plane and the other half lies in the yz plane. The origin ‘O’ is centre of the frame also. The loop carries current ‘i’. The magnetic filed at the centre is

 

•  (μ_0 i)/(2√2 πl)(i ̂-j ̂)
•  (μ_0 i)/4πl(-i ̂+j ̂)
•  (√2 μ_0 i)/πl(i ̂+j ̂)
•  (μ_0 i)/(√2 πl)(i ̂+j ̂)

Solution
 

Q6. Two very long, straight wires carrying, currents as shown in figure. Find all locations where the net magnetic field is zero

•  y=√2 x
•   y=x
• y=-x
•  y=-(x/2)

Solution

Q7.The force between two parallel current carrying wires is independent of

•  Their distance of separation
•  The length of the wires
•  The magnitude of currents
•  The radii of the wires

Solution

Q8.A proton of mass 1.67×10^(-27) kg and charge 1.67×10^(-19) C is projected with a speed of 2×10^6 ms^(-1) at an angle of 60° to the X-axis. If a uniform magnitude field of 0.10 T is applied along Y-axis, the path of proton is

•  A circle of radius 0.2 m and time period π×10^(-7)s
•  A circle of radius 0.1 m and time period 2π×10^(-7)s
•  A helix of radius 0.1 m and time period 2π×10^(-7)s
•  A helix of radius 0.2 m and time period 4π×10^(-7)s

Solution

Q9.An equilateral triangular loop is kept near to a current carrying long wire as shown in figure under the action of magnetic force alone, the loop

•  Must move along positive or negative X-axis
•  Must move in XY plane and not along X-or Y-axis
•  Does not move
•  Moves but which way we cannot predict

Solution

Q10. Two infinite long wires, each carrying current I, are lying along x-and y-axis, respectively. A charged particle, having a charge q and mass m, is projected with a velocity u along the straight line OP.. the path of the particle is (neglect gravity)

•  Straight line
•  Circle
•  Helix
• Cycloid

Solution