Related InterviewSolutions

• A parallel plate capacitor is connected to a battery as shown in figure. Consider two situations : . A : Key `K` is kept closed and plates of capacitors are moved apart using insulting handle. B : Key `K` is opened and plates of capacitors are moved apart using insulting handle. Choose the correct options (s).A. In `A : Q` remains same but `C` changesB. In `B : V` remains same but `C` changesC. In `A : V` remains same and hence `Q` changes.D. In `B : Q` remains same and hence `V` changes
• Find equivalent capacitance between points `A` and `B`. [Assume each conducting plate is having same dimensions and neglect the thickness of the plate `(epsilon_0A)/d=7muF` where A is area of plate]` `A. `2muF`B. `11muF`C. `12muF`D. `15 muF`
• In the given figure the capacitor of plate area `A` is charged upto charge `q`. The ratio of elongations (neglect force gravity) in springs `C` and `D` at equilibrium position is. .A. `(k_(1))/(k_(2))`B. `(k_(2))/(k_(1))`C. `k_(1)k_(2)`D. `sqrt((k_(1))/(k_(2))`
• The ratio of charge to potential of a body is known asA. conductanceB. capacitanceC. inductanceD. reactance
• A parallel plate capacitor filled with a material of dielectric constant `K` is charged to a certain voltage and is isolated. The dielectric material is removed. Then (a) The capacitance decreases by a factor `K` (b) The electric field reduces by a factor `K` ( c) The voltage across the capacitor increases by a factor `K` (d) The charge stored in the capacitor increases by a factor `K`.A. `a` and `b` are trueB. `a` and `c` are trueC. `b` and `c` are trueD. `b` and `d` are true
• Force acting upon charged particle kept between the plates of a charged condenser is `F`. If one of the plates of the condenser is removed, force acting on the same particle will become.A. zeroB. `F//2`C. `F`D. `2 F`
• A condenser is charged and then battery is removed. A dielectric plate is put between the plates of condenser, then correct statement isA. `Q` constant `V` and `U` decreaseB. `Q` constant `V` increases `U` decreasesC. `Q` increases `V` decreases `U` increasesD. `Q,V` and `U` increase
• The gap between the plates of a parallel plate capacitor is filled with glass of dielectric constant `k=6` and of specific resistivity `100 G Omega m`. The capacitance of the capacitor is `4.0mF`. When a voltage of `2.0 kV` is applied to the capacitor, the leakage current of the capacitor will be.A. `2.0 xx 10^(-6) A`B. `3.0 xx 10^(-6) A`C. `1.5 xx 10^(-3) A`D. Zero
• Two metallic plates placed side by side form three capacitors. The infinity and first face of first plate is one capacitor, the second face of first plate and first face second plate forms second capacitor and the second face of second plate and infinity forms the third capacitor, but the capacitance of first and third capacitance are extremely small.A. Both A and R falseB. Both A and R true and R is not correct reason for AC. A is true and R is falseD. Both A and R are true and R is correct reason of A.
• An infinitely long solid cylinder of radius ` R` has a uniform volume charge density `rho`. It has a spherical cavity of radius `R//2` with its centre on the axis of cylinder, as shown in the figure. The magnitude of the electric field at the point `P`, which is at a distance `2 R` form the axis of the cylinder, is given by the expression `( 23 r R)/( 16 k e_0)` . The value of `k` is . .