Physics-
General
Easy
Question
Find the emf and internal resistance of a single battery which is equivalent to a combination of three batteries as shown in figure.
The correct answer is:
Related Questions to study
physics-
In the circuit shown in figure reading of voltmeter is 
when only 
is closed, reading of voltmeter is 
when only 
is closed. The reading of voltmeter is 
when both and are closed then
In the circuit shown in figure reading of voltmeter is when only is closed, reading of voltmeter is when only is closed. The reading of voltmeter is when both and are closed then
physics-General
physics-
When an ammeter of negligible internal resistance is inserted in series with circuit it reads 1 A. When the voltmeter of very large resistance is connected across X it reads 1 V. When the point A and 
are shorted by a conducting wire, the voltmeter measures 10 V across the battery. The internal resistance of the battery is equal to
When an ammeter of negligible internal resistance is inserted in series with circuit it reads 1 A. When the voltmeter of very large resistance is connected across X it reads 1 V. When the point A and are shorted by a conducting wire, the voltmeter measures 10 V across the battery. The internal resistance of the battery is equal to
physics-General
physics-
Fig. shows a part of circuit. When a current I=1.5A passes through it in the direction shown, power delivered to it (section XY) is 75 W. Potential difference between X and Y and also the emf E of the cell are respectively ( assume that the cell has a negligible internal resistance)
Fig. shows a part of circuit. When a current I=1.5A passes through it in the direction shown, power delivered to it (section XY) is 75 W. Potential difference between X and Y and also the emf E of the cell are respectively ( assume that the cell has a negligible internal resistance)
physics-General
physics-
Two current elements P and Q have current voltage characteristics as shown below :
Which of the graphs given below represents current voltage characteristics when P and Q are in series.
Two current elements P and Q have current voltage characteristics as shown below :
Which of the graphs given below represents current voltage characteristics when P and Q are in series.
physics-General
physics-
A rod of length L and cross-section area A lies along the x-axis between x=0 and x=L. The material obeys Ohm's law and its resistivity varies along the rod according to 
. Find the total resistance of the rod. The end of the rod at x=0 is at a potential 
and it is zero at x=L.
A rod of length L and cross-section area A lies along the x-axis between x=0 and x=L. The material obeys Ohm's law and its resistivity varies along the rod according to . Find the total resistance of the rod. The end of the rod at x=0 is at a potential and it is zero at x=L.
physics-General
physics-
A material of resistivity 
is formed in the shape of a truncated cone of altitude 
. The top end has a radius a while bottom b. Assuming a uniform current density through any circular cross-section of the cone. Find the resistance between the two ends.
A material of resistivity is formed in the shape of a truncated cone of altitude . The top end has a radius a while bottom b. Assuming a uniform current density through any circular cross-section of the cone. Find the resistance between the two ends.
physics-General
physics-
The gap between two plane plates of a capacitor equal to d is filled with a gas. One of the plates emits 
electrons per second, which moving in an electric field, ionize gas molecules, this way each electron produces 
new electrons (and ions) along a unit length of its path. Find the electronic current at the opposite plate, neglecting the ionization of gas molecules by formed ions. Take charge on an electron as e
The gap between two plane plates of a capacitor equal to d is filled with a gas. One of the plates emits electrons per second, which moving in an electric field, ionize gas molecules, this way each electron produces new electrons (and ions) along a unit length of its path. Find the electronic current at the opposite plate, neglecting the ionization of gas molecules by formed ions. Take charge on an electron as e
physics-General
physics-
A converging mirror 
, a point source S and a diverging mirror 
are arranged as shwon in figure. The source is placed at a distance of 30cm from . The focal length of each of the mirrors is 20cm. Consider only the images formed by a maximum of two reflections. It is found that one image is formed on the source itself. Find the distance between the two mirrors.
A converging mirror , a point source S and a diverging mirror are arranged as shwon in figure. The source is placed at a distance of 30cm from . The focal length of each of the mirrors is 20cm. Consider only the images formed by a maximum of two reflections. It is found that one image is formed on the source itself. Find the distance between the two mirrors.
physics-General
physics-
An object is placed in front of a concave mirror of focal length f as shown if figure. Choose the correct shape of the image :
An object is placed in front of a concave mirror of focal length f as shown if figure. Choose the correct shape of the image :
physics-General
physics-
In the figure shown if the object ' O' moves towards the plane mirror, then the image (which is formed after successive reflections fram 
respectively) will move:
In the figure shown if the object ' O' moves towards the plane mirror, then the image (which is formed after successive reflections fram respectively) will move:
physics-General
physics-
In the figure shown, the image of a real object is formed at point I. AB is the principal axis of the mirror. The mirror must be :
In the figure shown, the image of a real object is formed at point I. AB is the principal axis of the mirror. The mirror must be :
physics-General
physics-
A ray of light is incident on a concave mirror. It is parallel to the principal axis and its height from principal axis is equal to the focal length of the mirror. The ratio of the distance of point B to the distance of the focus from the centre of curvature is ( AB is the reflected ray)
A ray of light is incident on a concave mirror. It is parallel to the principal axis and its height from principal axis is equal to the focal length of the mirror. The ratio of the distance of point B to the distance of the focus from the centre of curvature is ( AB is the reflected ray)
physics-General
physics-
The circular boundary of the concave mirror subtends a cone of half angle 
at its centre of curvature. The minimum value of for which ray incident on this mirror parallel to the principle axis suffers reflection more than one is
The circular boundary of the concave mirror subtends a cone of half angle at its centre of curvature. The minimum value of for which ray incident on this mirror parallel to the principle axis suffers reflection more than one is
physics-General
physics-
A concave mirror of focal length 20cm is cut into two parts from the middle and the two parts are moved perpendicularly by a distance 1cm from the previous principle axis AB. The distance between the images formed by the two parts. If the dbject is kept at a distance of 10cm from the pole of the original principal axis is
A concave mirror of focal length 20cm is cut into two parts from the middle and the two parts are moved perpendicularly by a distance 1cm from the previous principle axis AB. The distance between the images formed by the two parts. If the dbject is kept at a distance of 10cm from the pole of the original principal axis is
physics-General
physics-
Two blocks each of mass 
lie on a smooth table. They are attached to two other masses as shown in the figure. The pulleys and strings are light. An object O is kept at rest on the table. The sides AB&CD of the two blocks are made reflecting. The acceleration of two images formed in those two reflecting surfaces w.r.t. each other is:
Two blocks each of mass lie on a smooth table. They are attached to two other masses as shown in the figure. The pulleys and strings are light. An object O is kept at rest on the table. The sides AB&CD of the two blocks are made reflecting. The acceleration of two images formed in those two reflecting surfaces w.r.t. each other is:
physics-General
