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Answer the following questions: What is so special about the combination e/m? Why do we not simply talk of e and m

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

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Consider a 20 W bulb emitting light of wavelength 5000 A ° and shining on a metal surface kept at a distance 2m. Assume that the metal surface has work function of 2 eV and that each atom on the metal surface can be treated as a circular disk of radius 1.5 A ° .

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

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A parallel plate capacitor with air between the plates has a capacitance of 8 pF `(1pF = 10^(-12) F)`. What will be the capacitance if the distance between the plates is reduced by half and the space between them is filled with a substance of dielectric constant

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

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Two dielectric slabs of dielectric constant K1 and K2 are filled in between the two plates, each of area A, of the parallel plate capacitor as shown in the figure. Find the net capacitance of the capacitor? Area of each plate =

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

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Force of attraction between two point electric charges placed at a distance d in a medium is F. What distance apart should these be kept in the same medium, so that force between them becomes

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

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A hollow cylinder has a charge q coulomb within it. If `phi` is the electric flux in units of voltmeter associated with the curved surface B, the flux linked with the plane surface A in units of voltmeter will

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

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A surface has the area vector `vecA= (2hati + 3hatj)m^2`. The flux of an electric field through itifthe field is `vecE=-4hati V/m`

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

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An uncharged conductor of inner radius `R_1` and outer radius `R_2` contains a point charge q at the centre as shown in figure.(i) Find `vecE and V` at points `A,B and C`.(ii) If a point charge Q is kept out side the sphere at a distance `‘r’ ( > > R_2)` from centre then find out resultant force on charge Q and charge

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

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Electric potential at any point is `V = –5x + 3y + sqrt15z` , then the magnitude of the electric field is .....

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

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The displacement of a particle is represented by the equation `y = sin^3 ωt` . The motion

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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A tunnel is dug through the centre of the Earth. Show that a body of mass ‘m’ when dropped from rest from one end of the tunnel will execute simple harmonic

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Which among the curves shown in Fig. cannot possibly represent electrostatic field lines?

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

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A conducting wire XY of mass m and neglibile resistance slides smoothly on two parallel conducting wires as shown in Fig . The closed circuit has a resistance R due to AC. AB and CD are perfect conductors. There is a magnetic field` B = B(t )hatk` . Write

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

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A primary winding of transformer has 500 turns whereas its secondary has 5000 turns. Primary is connected to ac supply of 20V, 50Hz The secondary output

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

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A step down transformer is connected to main supply 200 V to operate a 6V, 30 w bulb. The current in primary

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

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In an ac circuit, the current is given by `I= 5sin[ 100 t -pi/2]` and the ac potential is `V = 200 sin 100t`. Then the power consumption

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

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An inductor L and capacitor C are connected in the circuit as shown in fig. The frequency of the power supply is equal to the resonant frequency of the circuit. Which ammeter will read zero

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

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Find the time required for 50Hz alternating current to change its value from zero to rms

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

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In a L–C circuit parallel combination of inductance of 0.01 H and a capacitor of `1muF` is connected to a variable frequency alternating current source as shown in figure. Draw a rough sketch of the current variation as the frequency is changed from 1kHz to

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

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A voltage of 10 V and frequency `10^3 Hz` is applied to `1/pi muF` capacitor in series with a resistor of `500Omega`. Find the power factor of the circuit and the power

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

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