ICSE physics
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Can 8.6 x 10-19 coulomb of charge be given to a conductor ? Explain.
No, because it is not the integral multiple of charge on electron or proton.
Q = ne
where n is an integral multiple.
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What will be the nature of the electric potential at a place where the electric field E = 0 ?
When electric field is 0, there will be constant electric potential because electric field is the gradient of electric potential.
What is the work done in turning an electric dipole through 360° ?
Amount of work done in turning the dipole through 360° is,
W = -PE [cos θ1 - cos θ2]
= -PE [cos 0° - cos 360°]
= 0.
Why is a potentiometer preferred over a voltmeter in measuring the emf of a cell ?
A potentiometer does not draw any current from the cell whose e.m.f. is to be determined. Whereas voltmeter always draw some current. Therefore, the e.m.f measured by voltmeter is slightly less than actual value of the e.m.f. of cell.
Two wires A and B of equal mass and of the same material are taken. The diameter of wire A is half the diameter of wire B. If the resistance of wire A is 24 Ω, calculate the resistance of wire B.
Given that, two wires have the same mass and same material.
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Mock Test Series
Mock Test Series