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Two concentric and coplanar circular loops P and Q have their radii in the ratio 2:3. Loop Q carries a current 9 A in the anticlockwise direction. For the magnetic field to be zero at the common centre, loop P must carry

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Important Questions on Sample Paper 1

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12th Uttar Pradesh Board
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Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 15 - Sample Paper 1>Exercise>Q 5
A long straight wire of circular cross section of radius a carries a steady current I. The current is uniformly distributed across its cross-section. The ratio of the magnitudes of magnetic field at a point distant a/2 above the surface of wire to that at a point distant a/2 below its surface is
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12th Uttar Pradesh Board
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Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 15 - Sample Paper 1>Exercise>Q 6
If the magnetising field on a ferromagnetic material is increased, its permeability
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12th Uttar Pradesh Board
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Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 15 - Sample Paper 1>Exercise>Q 7

An iron cored coil is connected in series with an electric bulb with an AC source as shown in the figure. When iron piece is taken out of the coil, the brightness of the bulb will

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12th Uttar Pradesh Board
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Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 15 - Sample Paper 1>Exercise>Q 8
Which of the following statement is NOT true about the properties of electromagnetic waves?
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12th Uttar Pradesh Board
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Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 15 - Sample Paper 1>Exercise>Q 9
A rectangular, a square, a circular and an elliptical loop, all in the (x-y) plane, are moving out of a uniform magnetic field with a constant velocityv→= vi^ .The magnetic field is directed along the negative z-axis direction. The induced emf, during the passage of these loops, out of the field region, will not remain constant for
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12th Uttar Pradesh Board
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Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 15 - Sample Paper 1>Exercise>Q 10
In a Young’s double slit experiment, the path difference at a certain point on the screen between two interfering waves is18th  of the wavelength. The ratio of intensity at this point to that at the centre of a bright fringe is close to
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12th Uttar Pradesh Board
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Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 15 - Sample Paper 1>Exercise>Q 11
The work function for a metal surface is 4.14 eV. The threshold wavelength for this metal surface is
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12th Uttar Pradesh Board
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Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 15 - Sample Paper 1>Exercise>Q 12
The radius of the innermost electron orbit of a hydrogen atom is 5.3×10–11 m. The radius of the n= 3 orbit is