Physics-
General
Easy
Question
A bullet of mass m and charge q is fired towards a solid uniformly charged sphere of radius R and total charge + q. If it strikes the surface of sphere with speed u, find the minimum speed u so that it can penetrate through the sphere. (Neglect all resistance forces or friction acting on bullet except electrostatic forces)
The correct answer is:
Related Questions to study
physics-
An infinite number of concentric rings carry a charge Q each alternately positive and negative. Their radii are 1, 2, 4, 8...... meters in geometric progression as shown in the figure. The potential at the centre of the rings will be
An infinite number of concentric rings carry a charge Q each alternately positive and negative. Their radii are 1, 2, 4, 8...... meters in geometric progression as shown in the figure. The potential at the centre of the rings will be
physics-General
physics-
A charged particle having some mass is resting in equilibrium at a height H above the centre of a uniformly charged non-conducting horizontal ring of radius R. The force of gravity acts downwards. The equilibrium of the particle will be stable
A charged particle having some mass is resting in equilibrium at a height H above the centre of a uniformly charged non-conducting horizontal ring of radius R. The force of gravity acts downwards. The equilibrium of the particle will be stable
physics-General
physics-
A particle of mass m and charge Q is placed in an electric field E which varies with time t ass 
. It will undergo simple harmonic motion of amplitude
A particle of mass m and charge Q is placed in an electric field E which varies with time t ass . It will undergo simple harmonic motion of amplitude
physics-General
physics-
The given figure shows a network of resistances and a battery.
Identify the correct statement(s)
The given figure shows a network of resistances and a battery.
Identify the correct statement(s)
physics-General
physics-
The figure shows a tetrahedron, each side of which has a resistance r
Choose the correct statement(s) related to the resistance between any two points
The figure shows a tetrahedron, each side of which has a resistance r
Choose the correct statement(s) related to the resistance between any two points
physics-General
physics-
Inside a super conducting ring six identical resistors each of resistance R are connected as shown in figure
The equivalent resistance(s)
Inside a super conducting ring six identical resistors each of resistance R are connected as shown in figure
The equivalent resistance(s)
physics-General
physics-
The figure shows a network of resistors and a battery. If 1A current flows through the branch CF, then answer the following questions
The current through
The figure shows a network of resistors and a battery. If 1A current flows through the branch CF, then answer the following questions
The current through
physics-General
physics-
Consider the circuit shown in the figure
Consider the circuit shown in the figure
physics-General
physics-
In the circuit shown E, F, G and H are cells of e.m.f. 2V, 1V, 3V and 1V respectively and their internal resistances are 2
, 1, 3 and 1 respectively
In the circuit shown E, F, G and H are cells of e.m.f. 2V, 1V, 3V and 1V respectively and their internal resistances are 2, 1, 3 and 1 respectively
physics-General
physics-
A conductor is made of an isotropic material and has shape of a truncated cone. A battery of constant emf is connected across it and its left end is earthed as shown in figure. If at a section distant x from left end, electric field intensity, potential and the rate of generation of heat per unit length are E, V and H respectively, which of the following graphs is/are correct?
A conductor is made of an isotropic material and has shape of a truncated cone. A battery of constant emf is connected across it and its left end is earthed as shown in figure. If at a section distant x from left end, electric field intensity, potential and the rate of generation of heat per unit length are E, V and H respectively, which of the following graphs is/are correct?
physics-General
physics-
A metallic conductor of irregular cross-section is as shown in the figure. A constant potential difference is applied across the ends (1) and (2). Then :
A metallic conductor of irregular cross-section is as shown in the figure. A constant potential difference is applied across the ends (1) and (2). Then :
physics-General
physics-
In the given potentiometer circuit, the resistance of the potentiometer wire AB is 
. C is a cell of internal resistance r. The galvanometer G does not give zero deflection for any position of the jockey J. Which of the following cannot be a reason for this?
In the given potentiometer circuit, the resistance of the potentiometer wire AB is . C is a cell of internal resistance r. The galvanometer G does not give zero deflection for any position of the jockey J. Which of the following cannot be a reason for this?
physics-General
physics-
In the circuit shown the readings of ammeter and voltmeter are 4A and 20V respectively. The meters are non ideal, then R is:
In the circuit shown the readings of ammeter and voltmeter are 4A and 20V respectively. The meters are non ideal, then R is:
physics-General
physics-
The value of the resistance R in figure is adjusted such that power dissipated in the 
resistor is maximum. Under this condition
The value of the resistance R in figure is adjusted such that power dissipated in the resistor is maximum. Under this condition
physics-General
physics-
Two circuits (shown below) are called ‘Circuit A’ and ‘Circuit B’. The equivalent resistance of ‘Circuit a’ is x and that of ‘Circuit B’ is y between 1 and 2.
Two circuits (shown below) are called ‘Circuit A’ and ‘Circuit B’. The equivalent resistance of ‘Circuit a’ is x and that of ‘Circuit B’ is y between 1 and 2.
physics-General
