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Assertion: If the path of a charged particle in a region of uniform electric and magnetic field is not a circle, then its kinetic energy may remain constant. Reason: In a combined electric and magnetic fields region, a moving charge experiences a net force `F =qE +q(v xx B)`, where symbols have their usual

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Assertion: The current sensitivity of a galvanometer is the deflection of current per unit current passing through the coil. Reason: The galvanometer can be used as a detector to check, if a current is flowing in the

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Assertion: Basic difference between an electric line and magnetic line of force is that former is discontinuous and the latter is continuous or endless. Reason: No electric lines of forces exist inside a charged conductor but magnetic lines do exist inside a

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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The North-pole of a magnet is falling on a metallic ring as shown in the figure. The direction of induced current, if looked from upside, in the ring will

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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The core of a transformer is laminated to

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Eddy CurrentCoil is wound over metallic core is helpful in reducing eddy currents in the metallic cores of transformers, electric motors, induction furnaces and other such devices (as shown below). Eddy currents are undesirable since they heat up the core and dissipate electrical energy in the form of heat. These currents are minimised by using laminations of metal to make a metal core. Eddy currents in a metal core of transformer can be

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Eddy CurrentCoil is wound over metallic core is helpful in reducing eddy currents in the metallic cores of transformers, electric motors, induction furnaces and other such devices (as shown below). Eddy currents are undesirable since they heat up the core and dissipate electrical energy in the form of heat. These currents are minimised by using laminations of metal to make a metal core. induction furnace is used to

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Eddy CurrentCoil is wound over metallic core is helpful in reducing eddy currents in the metallic cores of transformers, electric motors, induction furnaces and other such devices (as shown below). Eddy currents are undesirable since they heat up the core and dissipate electrical energy in the form of heat. These currents are minimised by using laminations of metal to make a metal core. induction furnace can be utilised to

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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`220 V, 50 Hz, AC` is applied to a resistor. The instantaneous value of voltage

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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In an L-C-R circuit, capacitance is changed from C to 2C. For the resonant frequency to remain unchanged, the inductance should be changed from `L` to

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Suppose while sitting in a parked car, you notice a jogger approaching towards you in the side view mirror of R = 2 m. If the jogger is running at a speed of 5 m s–1, how fast the image of the jogger appear to move when the jogger is

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Fig (a) and (b) show refraction of a ray in air incident at 60° with the normal to a glass-air and water-air interface, respectively. Predict the angle of refraction in glass when the angle of incidence in water is 45º with the normal to a water-glass interface [Fig.

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Under what condition, does a biconvex lens of glass having a certain refractive index act as a plane glass sheet when immersed in a

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Draw a ray diagram to show the working of a compound microscope. Deduce an expression for the total magnification when the final image is formed at the near point. In a compound microscope, an object is placed at a distance of 1.5 cm from the objective of focal length 1.25 cm. If the eyepiece has a focal length of 5 cm and the final image is formed at the near point. Estimate the magnifying power of the

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Draw a diagram to show refraction of a plane wavefront incident on a convex lens and hence draw the refracted

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The figure shows a double slit experimental set up for observing interference fringes due to different interference component colours of white light. What would be the predominant colour of the fringes observed at the point.(i) O (the central point) (ii) P, where, `S_2P - S_1P =(lambda_b)/2` ? (here, `lambda_b` is the wavelength of the blue

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A parallel beam of light of wavelength 500 nm falls on a narrow slit and the resulting diffraction pattern is observed on a screen 1 m away. It is observed that the first minimum is at a distance of 2.5 mm from the centre of the screen. Calculate the width of the

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Draw a new wavefornt from the given incident

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Lighth is coming from medium 1. Some part of light is being refracted and some part is reflectedWhat is the incident wavefront_______refracted

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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What is the de Broglie wavelength of a bullet of mass 0.040 kg travelling at the speed of 1.0

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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