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The following table gives the values of work functions for a few sensitive metals. S. No. Metal Work function(eV) 1 Na 1.92 2 K 2.15 3 Mo 4.17 If each of these metals is exposed to radiations of wavelength 3300nm, which of these will not exit photoelectrons and

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The instantancous voltage through a device of impedance `20Omega` is `ε= 80 sin100π t ` . The effective value of the current

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What will be the total flux through the faces of the cube (Fig. ) with side of length a if a charge q is placed at (I) A: a corner of the cube.(II) B: mid-point of an edge of the

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What will be the total flux through the faces of the cube (Fig. ) with side of length a if a charge q is placed at (I) C: centre of a face of the cube.(II) D: mid-point of B and

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A current `I` flows through a long straight conductor which is bent into a circular loop of radius R in the middle as shown in the figure.The magnitude of the net magnetic field at point `O` will

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NCERT Chapter14 Oscillations SHM Intro

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Consider a region inside which there are various types of charges but the total charge is zero. At points outside the

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An electric dipole is placed in a uniform electric field. The dipole will

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What is SI unit of charge?

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Fig. shows a long straight wire of a circular cross-section (radius a) carrying steady current I. The current I is uniformly distributed across this cross-section. Calculate the magnetic field in the region r < a and r >

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The electric field components in Fig. are Ex = αx 1/2 , Ey = Ez = 0, in which α = 800 N/C m1/2. Calculate the charge within the cube. Assume that a = 0.1

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Assertion: Due to two point charges, electrical field and electric potential cannot be zero at same point simultaneously. Reason: Field is a vector quantity and potential a scalar

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Two identical balls having like charges and placed at a certain distance apart repel eachother with a certain force. They are brought in contact and then moved apart to a distanceequal to half their initial separation. The force of repulsion between them increases 4.5times in comparison with the initial value. The ratio of the initial charges of the balls

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What is electrostatics?

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The output of a step-down transformer is measured to be 24 V when connected to a 12 watt light bulb. The value of the peak current

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For an LCR circuit driven at frequency ω, the equation reads`L (dl)/(dt)+Ri+q/c= V_i= V_m sinωt` Interpret each term

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Electric charges of `1muC, - 1muC and 2muC` are placed in air at the corners A, B and C respectively of an equilateral triangle ABC having length of each side 10 cm. The resultant force on the charge at C

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A point charge of 2.0 µC is at the centre of a cubic Gaussian surface 9.0 cm on edge. What is the net electric flux through the

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Two identical circular loops of metal wire are lying on a table near to each other without touching.Loop A carries a current which increasing with time.In response the loop

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Five long wires A, B, C, D and E, each carrying current I are arranged to form edges of a pentagonal prism as shown in Fig. Each carries current out of the plane of paper. What if current in one of the wire (say) A is

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

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