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The particle P shown in figure has a mass of 10 mg and a charge of −0⋅01 µC. Each plate has a surface area 100 cm2 on one side. What potential difference V should be applied to the combination to hold the particle P in equilibrium?
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An iron needle is attracted to the ends of a bar magnet but not to the middle region of the magnet. Is the material making up the ends of a bare magnet different from that of the middle region?
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Two bar magnets are placed close to each other with their opposite poles facing each other. In absence of other forces, the magnets are pulled towards each other and their kinetic energy increases. Does it contradict our earlier knowledge that magnetic forces cannot do any work and hence cannot increase kinetic energy of a system?
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A bar magnet of length 1 cm and cross-sectional area 1.0 cm2 produces a magnetic field of 1.5 × 10−4 T at a point in end-on position at a distance 15 cm away from the centre. (a) Find the magnetic moment M of the magnet. (b) Find the magnetisation I of the magnet. (c) Find the magnetic field B at the centre of the magnet.
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To convert mechanical energy into electrical energy, one can use
(a) DC dynamo
(b) AC dynamo
(c) motor
(d) transformer
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When a Coolidge tube is operated for some time it becomes hot. Where does the heat come from?
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In a Coolidge tube, electrons strike the target and stop inside it. Does the target get more and more negatively charged as time passes?
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Can X-rays be used for photoelectric effect?
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Can X-rays be polarised?
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X-ray and visible light travel at the same speed in vacuum. Do they travel at the same speed in glass?
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Characteristic X-rays may be used to identify the element from which they are being emitted. Can continuous X-rays be used for this purpose?
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Is it possible that in a Coolidge tube characteristic Lα X-rays are emitted but not Kα X-rays?
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Can Lα X-ray of one material have shorter wavelength than Kα X-ray of another?
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Can a hydrogen atom emit characteristic X-rays?
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Why is exposure to X-rays injurious to health but not exposure to visible light, when both are electromagnetic waves?
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An X-ray beam can be deflected
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Consider a photon of a continuous X-ray coming from a Coolidge tube. Its energy comes from
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The energy of a photon of a characteristic X-ray from a Coolidge tube comes from
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If the potential difference applied to the tube is doubled and the separation between the filament and the target is also doubled, the cutoff wavelength
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If the current in the circuit for heating the filament is increased, the cutoff wavelength
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