Electrostatics by Rajeev Gupta

A duetarium and an alpha particle are placed in an electric field. The force acting on them are F₁ and F₂ and their acceleration are a₁ and a₂ respectively, then

• F₁= F₂

• F₁ > F₂

• a_{1 =} a₂

• F

• F / 16

• F / 8

• F / 2

A particle of mass m and charges +q₁ moves diametrically through s uniformly charged spheres of radius R with total charge - q₂. If q₁ performs SHM then its time period will be

The dipole moment of the system is

The flux of electric field through the hemispherical surface will be EE

A particle of mass m and charge q is thrown at a speed u against a uniform electric field E. The distance it travelled before coming to rest will be

Which option is incorrect for electrostatic field?

• It is conservative in nature

• It may be non-conservative if it is variable electric field

• it follows inverse square law

• It produces lengthwise contraction between dissimilar charges

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• 
• 
• 

An electron falls from rest through a vertical distance h in a uniform and vertically upward directed electric field E. The direction of electric field is reversed keeping its magitude the same. A proton is allowed to fall from rest in it same vertical distance h. The time of fall of electron in comparision to the time of proton will be

• smalller

• 5 times greater

• equal

• 10 times greater

Three charges + 4q, Q and q are placed in a straight line of length l at points 0, l/2, l respectively. What should be Q in order to make net force on q to be zero?

• • - q

• • - 2 q

• • - q/2

• 4 q