ICSE physics
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State Gauss’s theorem.
Gauss’s theorem : It states that the electric flux fE, through any closed surface is 1/Î0 times the total charge q enclosed by the surface.
Mathematically, 
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What will be the net electric force acting on an electric dipole placed in a uniform electric field ?
The net electric force on an electric dipole placed in a uniform electric field is zero.
Calculate the electric current density in a uniform wire connected to a battery of emf 3.5 V and negligible internal resistance. The resistance of the wire is 2.0 Ω and its area of cross section is 0.70 x 10-6 m.
Given,
EMF of battery = 3.5V
Resistance of wire = 2.0 Ω
Area of cross section = 0.70 x 10-6m2
I = 1.75 A
Current density, J = 
i.e., J = 2.5 x 106 A/m2
Name the two conservation laws implied in Kirchoffs laws for electric circuits.
Two conservation laws implied in Kirchoffs law for circuits are —
(a) Law of conservation of energy
(b) Law of conservation of change i.e., total current into any point in a circuit is equal to the total current out of that point.
Write in vector form, the defining equation for a magnetic field B at a point.
Force acting on a charged particle in a magnetic field B is given by,
F = q v x B
where,
v is the velocity of the charged particle and
b is the magnetic field acting on the particle.
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Mock Test Series
Mock Test Series