Electricity and Magnetism Prep
Full explanation, worked examples & memory tricks in the app
Electricity and Magnetism Prep
Hindi 9 leveled MCQs Free
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3 marks Medium answer
Two positive point charges of 4C and 1C are situated at a distance of 3 meters from each-other. Where should a third positive charge of 1C must be placed on the line joining the two so that it remains unaffected.
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At a distance of 1 meter from the 4C charge.
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1 marks Short answer
What is the intensity of electric field and potential at the centre of a charged hollow spherical conductor?
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Electric field intensity is zero and potential is constant.
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1 marks Short answer
A proton and an α-particle are allowed to enter one by one in a uniform magnetic field perpendicularly. What will be the ratio of their angular velocities in circular orbits?
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The ratio of their angular velocities is 2:1.
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1 marks Short answer
A rectangular plane of area 10 cm² is inclined at an angle of 30° with magnetic field of 50 tesla. What will be the flux passing through it?
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Magnetic flux = B * A * cos(θ) = 50 * 10 * cos(30°) = 500√3/3 Wb.
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1 marks Short answer
Show an electromagnetic wave by figure.
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Diagram of an electromagnetic wave showing electric and magnetic fields perpendicular to each other.
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1 marks Short answer
Refractive index of glass w.r.t. air is 3/2 and refractive index of water w.r.t. air is 4/3. What would be the wavelength in glass and water of light having wavelength 480 nm. in air?
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Wavelength in glass = 480 nm / (3/2) = 320 nm; in water = 480 nm / (4/3) = 360 nm.
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1 marks Short answer
What will be the de-Broglie wavelength of an electron accelerated by 64 volts potential difference?
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De-Broglie wavelength λ = h / √(2meV) where V = 64V.
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1 marks Short answer
What inferences are drawn from Frank-Hertz experiment?
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It demonstrates quantized energy levels in atoms.
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1 marks Short answer
Write the name of minority charge carriers in P-type and n-type semiconductors.
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Minority carriers: P-type: electrons; n-type: holes.
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