Physics
General
Easy
Question
A cubical block of side ‘L’ rests on a rough horizontal surface with coefficient of friction ‘m’ A horizontal force F is applied on the block as shown. If the coefficient of friction is sufficiently high so that the block does not slide before toppling, the minimum force required to topple the block is
 mg



The correct answer is:
applying the condition of rotational equilibrium
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If the time period of a pendulum is 1 sec, then what is the length of the pendulum at point of intersection of lT and graph
If the time period of a pendulum is 1 sec, then what is the length of the pendulum at point of intersection of lT and graph
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Order and degree of differential equation are
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The solution of is
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For the given figure, calculate zero correction.
For the given figure, calculate zero correction.
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Three capacitors are connected as shown in the figure to a battery of volt. If the capacitor breaks down electrically the change in total charge on the combination of capacitors is
Since, are parallel to their equivalent capacitance will be . Now, are in series, so the net equivalent capacitances of circuit.
Since, is the voltage of the battery, so charge on this system
If the capacitor breaks down then total equivalent capacitance
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Since, is the voltage of the battery, so charge on this system
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New charge stored
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Three capacitors are connected as shown in the figure to a battery of volt. If the capacitor breaks down electrically the change in total charge on the combination of capacitors is
physicsGeneral
Since, are parallel to their equivalent capacitance will be . Now, are in series, so the net equivalent capacitances of circuit.
Since, is the voltage of the battery, so charge on this system
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Since, is the voltage of the battery, so charge on this system
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As the capacitors 4 and 2 are connected in parallel and are in series with 6 capacitor, their equivalent capacitance is
Charge in the circuit
Since, the capacitors and 2 are connected in parallel, therefore potential difference across them is same.
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or
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As the capacitors 4 and 2 are connected in parallel and are in series with 6 capacitor, their equivalent capacitance is
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Since, the capacitors and 2 are connected in parallel, therefore potential difference across them is same.
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If then y satisfies
If then y satisfies
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In the figure, a proton moves a distance d in a uniform electric field E as shown in the figure. Does the electric field do a positive or negative work on the proton? Does the electric potential energy of the proton increase or decrease?
Since, the proton is moving against the direction of electric field so, work is done by the proton against electric field. It implies that electric field does negative work on the proton.
Again, proton is moving in electric field from low potential region to high potential region hence, its potential energy increases.
Again, proton is moving in electric field from low potential region to high potential region hence, its potential energy increases.
In the figure, a proton moves a distance d in a uniform electric field E as shown in the figure. Does the electric field do a positive or negative work on the proton? Does the electric potential energy of the proton increase or decrease?
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Since, the proton is moving against the direction of electric field so, work is done by the proton against electric field. It implies that electric field does negative work on the proton.
Again, proton is moving in electric field from low potential region to high potential region hence, its potential energy increases.
Again, proton is moving in electric field from low potential region to high potential region hence, its potential energy increases.
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Solution of is
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Two charges and are placed 30 cm apart, as shown in the figure. A third charge is moved along the arc of a circle of radius 40 cm from C to D. The change in the potential energy of the system is where k is
When charge is at , then its potential energy is
Where charge is at , then
Hence, change in potential energy
Where charge is at , then
Hence, change in potential energy
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When charge is at , then its potential energy is
Where charge is at , then
Hence, change in potential energy
Where charge is at , then
Hence, change in potential energy
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Or
Or
Similarly,
Since,
therefore
Or
Or
Similarly,
Since,
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Figure shows three spherical and equipotential surfaces A, B and C round a point charge q. The potential difference. If and be the distance between them. Then
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Potential difference between two equipotential surfaces A and B.
Or
Or
Similarly,
Since,
therefore
Or
Or
Similarly,
Since,
therefore
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In IInd case, when charge is moved from C to D.
Electric potential energy of system in that case
Electric potential energy of system
In IInd case, when charge is moved from C to D.
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In IInd case, when charge is moved from C to D.
Electric potential energy of system in that case
Electric potential energy of system
In IInd case, when charge is moved from C to D.
Electric potential energy of system in that case
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Consider three concentric shells of metal A, B and C are having radii a, b and c respectively as shown in the figure Their surface charge densities are respectively. Calculate the electric potential on the surface of shell A
The electric potential on the surface of shell
Or
Or