Physics-
General
Easy
Question
The figure shows a charge q placed inside a cavity in an uncharged conductor. Now if an external electric field is switched on
- only induced charge on outer surface will redistribute
- only induced charge on inner surface will redistribute
- both induced charge on outer and inner surface will redistribute
- force on charge q placed inside the cavity will change
The correct answer is: only induced charge on outer surface will redistribute
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A charge Q is placed at a distance of 4R above the centre of a disc of radius R. The magnitude of flux through the disc is 
. Now a hemispherical shell of radius R is placed over the disc such that it forms a closed surface. The flux through the curved surface taking direction of area vector along outward normal as positive, is
A charge Q is placed at a distance of 4R above the centre of a disc of radius R. The magnitude of flux through the disc is . Now a hemispherical shell of radius R is placed over the disc such that it forms a closed surface. The flux through the curved surface taking direction of area vector along outward normal as positive, is
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A simple electric dipole consists of a positive and negative charge of equal magnitude held very close to one another. The components of the electric field pointing away from a dipole has magnitude. 
where is the distance from the center of the dipole to the point in question, 
is a universal constant and p in the magnitude of the dipole moment vector, which specifics the strength and direction of the dipole. Here, 
denotes the angle between the dipole moment vector and d, the displacement vector (from the dipole to the point in question).
A student performs an experiment to determine if a mystery object is an electric dipole. (The mystery object is only a few millimeters long) Using a sophisticated instrument, the student measures the component of the electric field pointing away from the object, at various distances from the center of the object. By taking each measurement along an imaginary line emanating outward from the center of the mystery object, he ensures that stays the same throughout the experiments. Table 1 shows the electric field be found at various distances.
Consider the electric field produced by a dipole. If the dipole moment and the distance from the dipole are both doubled, while is kept the same, the electric field component pointing away from the dipole decreases by a factor of :
A simple electric dipole consists of a positive and negative charge of equal magnitude held very close to one another. The components of the electric field pointing away from a dipole has magnitude. where is the distance from the center of the dipole to the point in question, is a universal constant and p in the magnitude of the dipole moment vector, which specifics the strength and direction of the dipole. Here, denotes the angle between the dipole moment vector and d, the displacement vector (from the dipole to the point in question).
A student performs an experiment to determine if a mystery object is an electric dipole. (The mystery object is only a few millimeters long) Using a sophisticated instrument, the student measures the component of the electric field pointing away from the object, at various distances from the center of the object. By taking each measurement along an imaginary line emanating outward from the center of the mystery object, he ensures that stays the same throughout the experiments. Table 1 shows the electric field be found at various distances.
Consider the electric field produced by a dipole. If the dipole moment and the distance from the dipole are both doubled, while is kept the same, the electric field component pointing away from the dipole decreases by a factor of :
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Two insulated light rods of length l and 2l are placed in xy plane such their mid point is origin and they are free to rotate in xy plane about z-axis. Two +q charges are fixed at two ends of bigger rod and two - q charges are fixed at two ends of smaller rod.
Work done to rotate smaller rod through 180° about z-axis
Two insulated light rods of length l and 2l are placed in xy plane such their mid point is origin and they are free to rotate in xy plane about z-axis. Two +q charges are fixed at two ends of bigger rod and two - q charges are fixed at two ends of smaller rod.
Work done to rotate smaller rod through 180° about z-axis
physics-General
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Two insulated light rods of length l and 2l are placed in xy plane such their mid point is origin and they are free to rotate in xy plane about z-axis. Two +q charges are fixed at two ends of bigger rod and two - q charges are fixed at two ends of smaller rod.
Electric field at point (a,0,0) is E. Now if a>>l then
Two insulated light rods of length l and 2l are placed in xy plane such their mid point is origin and they are free to rotate in xy plane about z-axis. Two +q charges are fixed at two ends of bigger rod and two - q charges are fixed at two ends of smaller rod.
Electric field at point (a,0,0) is E. Now if a>>l then
physics-General
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Two insulated light rods of length l and 2l are placed in xy plane such their mid point is origin and they are free to rotate in xy plane about z-axis. Two +q charges are fixed at two ends of bigger rod and two - q charges are fixed at two ends of smaller rod.
What is electric dipole moment of system ?
Two insulated light rods of length l and 2l are placed in xy plane such their mid point is origin and they are free to rotate in xy plane about z-axis. Two +q charges are fixed at two ends of bigger rod and two - q charges are fixed at two ends of smaller rod.
What is electric dipole moment of system ?
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Three points charges are placed at the corners of an equilateral triangle of side L as shown in the figure.
Three points charges are placed at the corners of an equilateral triangle of side L as shown in the figure.
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In the circuit shown in figure : 
and 
mF. Current in 
circuit is 
in 
circuit is 
and the main current is 
Phase different between and is
In the circuit shown in figure : and mF. Current in circuit is in circuit is and the main current is Phase different between and is
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In the LCR circuit shown in figure
A) current will lead the voltage
B) rms value of current is 20 A
C) power factor of the circuit is 
D) voltage drop across resistance is 100 V
In the LCR circuit shown in figure
A) current will lead the voltage
B) rms value of current is 20 A
C) power factor of the circuit is
D) voltage drop across resistance is 100 V
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In the circuit shown in fig. If both the lamps 
and 
are identical.
In the circuit shown in fig. If both the lamps and are identical.
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The vector diagram of current and voltage for a circuit is as shown. The components of the circuit will be
The vector diagram of current and voltage for a circuit is as shown. The components of the circuit will be
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The diagram shows a capacitor C and a resistor R connected in series to an ac source. 
and 
are voltameters and A is an ammeter consider now the following statements
I) Readings in A and are always in phase
II) Reading in is ahead in phase with reading in
III) Readings in A and are always in phase which of these statements are/is correct
The diagram shows a capacitor C and a resistor R connected in series to an ac source. and are voltameters and A is an ammeter consider now the following statements
I) Readings in A and are always in phase
II) Reading in is ahead in phase with reading in
III) Readings in A and are always in phase which of these statements are/is correct
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In the circuit shown in the figure, the ac source gives a voltage V=20cos(2000t). Neglecting source resistance, the voltmeter and ammeter reading will be
In the circuit shown in the figure, the ac source gives a voltage V=20cos(2000t). Neglecting source resistance, the voltmeter and ammeter reading will be
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The resonance point in 
and 
curves is
The resonance point in and curves is
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A constant voltage at different frequencies is applied across a capacitance 
as shown in the figure. Which of the following graphs
Correctly depicts the variation of current with frequency ?
A constant voltage at different frequencies is applied across a capacitance as shown in the figure. Which of the following graphs
Correctly depicts the variation of current with frequency ?
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A box P and a coil Q are connected in series with an ac source of variable frequency. The rms value of emf of source is constant at 10 V. Box P contains a capacitance of 
in series with a resistance of 
. Coil Q has a self-inductance 
and a resistance of 
in series. The frequency is adjusted so that the maximum current flows in P and Q.
voltage across 
is.
A box P and a coil Q are connected in series with an ac source of variable frequency. The rms value of emf of source is constant at 10 V. Box P contains a capacitance of in series with a resistance of . Coil Q has a self-inductance and a resistance of in series. The frequency is adjusted so that the maximum current flows in P and Q.
voltage across is.
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