HARD
JEE Main
IMPORTANT
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A 1 m long copper wire carries a current of 1 A. If the cross section of the wire is 2.0 mm2 and the resistivity of copper is 1.7×10-8 Ω m. The force experienced by moving electron in the wire is _____×10-23 N

(Charge of electron=1.6×10-19C )

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Important Questions on Electrostatics

HARD
JEE Main
IMPORTANT

A long cylindrical volume contains a uniformly distributed charge of density ρ C m-3. The electric field inside the cylindrical volume at a distance x=2ε0ρ m from its axis is _____ V m-1.

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MEDIUM
JEE Main
IMPORTANT
A charge of 4μC is to be divided into two. The distance between the two divided charges is constant. The magnitude of the divided charges so that the force between them is maximum, will be:
EASY
JEE Main
IMPORTANT

As shown in the figure, in steady state, the charge stored in the capacitor is _____×10-6 C.

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HARD
JEE Main
IMPORTANT
A parallel plate capacitor with width 4 cm, length 8 cm and separation between the plates of 4 mm is connected to a battery of 20 V. A dielectric slab of dielectric constant 5 having length 1 cm, width 4 cm and thickness 4 mm is inserted between the plates of parallel plate capacitor. The electrostatic energy of this system will be _____ ϵ0 J. (Where ϵ0 is the permittivity of free space)
MEDIUM
JEE Main
IMPORTANT
Two capacitors, each having capacitance 40μF are connected in series. The space between one of the capacitors is filled with dielectric material of dielectric constant K such that the equivalence capacitance of the system became 24μF. The value of K will be :
EASY
JEE Main
IMPORTANT
Two electric dipoles of dipole moments 1.2×10-30 cm and 2.4×10-30 cm are placed in two difference uniform electric fields of strengths 5×104 N C-1 and 15×104 N C-1 respectively. The ratio of maximum torque experienced by the electric dipoles will be 1x. The value of x is _____ .
HARD
JEE Main
IMPORTANT
A slab of dielectric constant K has the same cross-sectional area as the plates of a parallel plate capacitor and thickness 34d, where d is the separation of the plates. The capacitance of the capacitor when the slab is inserted between the plates will be :
(Given C0= Capacitance of capacitor with air as medium between plates.)
HARD
JEE Main
IMPORTANT

A uniform electric field E=8mcV m-1 is created between two parallel plates of length 1 m as shown in figure, (where m= mass of electron and e= charge of electron). An electron enters the field symmetrically between the plates with a speed of 2 m s-1. The angle of the deviation θ of the path of the electron as it comes out of the field will be _____ .

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