Physics-
General
Easy
Question
When an AC source of emf is connected across a circuit, the phase difference between the E and the current i in the circuit is observed to be , as shown in the diagram. If the circuit consists possibly only of R-C or R-L or L-C series, find the relationship between the two elements.
The correct answer is:
Current leads emf so circuit is R – C.
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Statement-1 : A spherical surface of radius of curvature R separates two media of refractive index n1 and n2 as shown. If an object O (a thin small rod) is placed upright on principal axis at a distance R from pole (i.e., placed at centre of curvature), then the size of image is same as size of object.
Statement-2 : If a point object is placed at centre of curvature of spherical surface separating two media of different refractive index, then the image is also formed at centre of curvature, i.e., image distance is equal to object distance.
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Statement-2 : If a point object is placed at centre of curvature of spherical surface separating two media of different refractive index, then the image is also formed at centre of curvature, i.e., image distance is equal to object distance.
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Statement 2 : For a ray going from denser to rarer medium, the ray may suffer total internal reflection.
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Statement-1 : A white parallel beam of light is incident on a plane glass-vacuum interface as shown. The beam may not undergo dispersion after suffering deviation at the interface (The beam is not incident normally on the interface.)
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Statement-1 : A white parallel beam of light is incident on a plane glass-vacuum interface as shown. The beam may not undergo dispersion after suffering deviation at the interface (The beam is not incident normally on the interface.)
Statement 2 : Vacuum has same refractive index for all colours of white light
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For an LCR series circuit, phasors of current i and applied voltage are shown in diagram at t =0. Which of the following is/are correct?
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For the given circuit
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A periodic voltage V varies with time t as shown in the figure. T is the time period. The r.m.s. value of the voltage is:-
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Figure shows a conducting rod of negligible resistance that can slide on smooth U-shaped rail made of wire of resistance 1/m. Position of the conducting rod at t = 0 is shown. A time t dependent magnetic field B = 2t Tesla is switched on at t = 0
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physics-General
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STATEMENT–1 : Consider the arrangement shown below. A smooth conducting rod, CD, is lying on a smooth U-shaped conducting wire making good electrical contact with it. The U-shape conducting wire is fixed and lies in horizontal plane. There is a uniform and constant magnetic field B in vertical direction (perpendicular to plane of page in figure). If the magnetic field strength is decreased, the rod moves towards right.
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physics-General
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