Physics-
General
Easy
Question
In the circuit diagram shown, 
. The effective current through the source is:
- 2A
- 0.5A
The correct answer is:
Related Questions to study
physics-
The voltage time (V - t) graph for triangular wave having peak value. 
is as shown in figure The rms value of V in time interval from t = 0 to 
is
The voltage time (V - t) graph for triangular wave having peak value. is as shown in figure The rms value of V in time interval from t = 0 to is
physics-General
physics-
In a black box of unknown elements (L, C or R or any other combination) an AC voltage 
is applied and current in the circuit was found to be 
. Then the unknown elements in the box may be :
In a black box of unknown elements (L, C or R or any other combination) an AC voltage is applied and current in the circuit was found to be . Then the unknown elements in the box may be :
physics-General
physics-
If the readings of 
and 
are 100 volt each then reading of 
is :
If the readings of and are 100 volt each then reading of is :
physics-General
physics-
In the circuit diagram shown, 
. The effective current through the source is:
In the circuit diagram shown, . The effective current through the source is:
physics-General
physics-
A current source sends a current 
. When connected across an unknown load gives a voltage output of, 
across that load. Then voltage across the current source may be brought in phase with the current through it by:
A current source sends a current . When connected across an unknown load gives a voltage output of, across that load. Then voltage across the current source may be brought in phase with the current through it by:
physics-General
physics-
When an AC source of emf 
is connected across a circuit, the phase difference between the E and the current i in the circuit is observed to be 
, as shown in the diagram. If the circuit consists possibly only of R-C or R-L or L-C series, find the relationship between the two elements.
When an AC source of emf is connected across a circuit, the phase difference between the E and the current i in the circuit is observed to be , as shown in the diagram. If the circuit consists possibly only of R-C or R-L or L-C series, find the relationship between the two elements.
physics-General
physics-
Statement-1 : A spherical surface of radius of curvature R separates two media of refractive index n1 and n2 as shown. If an object O (a thin small rod) is placed upright on principal axis at a distance R from pole (i.e., placed at centre of curvature), then the size of image is same as size of object.
Statement-2 : If a point object is placed at centre of curvature of spherical surface separating two media of different refractive index, then the image is also formed at centre of curvature, i.e., image distance is equal to object distance.
Statement-1 : A spherical surface of radius of curvature R separates two media of refractive index n1 and n2 as shown. If an object O (a thin small rod) is placed upright on principal axis at a distance R from pole (i.e., placed at centre of curvature), then the size of image is same as size of object.
Statement-2 : If a point object is placed at centre of curvature of spherical surface separating two media of different refractive index, then the image is also formed at centre of curvature, i.e., image distance is equal to object distance.
physics-General
physics-
Statement-1 : A ray is incident from outside on a glass sphere surrounded by air as shown. This ray may suffer total internal reflection at second interface.
Statement 2 : For a ray going from denser to rarer medium, the ray may suffer total internal reflection.
Statement-1 : A ray is incident from outside on a glass sphere surrounded by air as shown. This ray may suffer total internal reflection at second interface.
Statement 2 : For a ray going from denser to rarer medium, the ray may suffer total internal reflection.
physics-General
physics-
Statement-1 : A white parallel beam of light is incident on a plane glass-vacuum interface as shown. The beam may not undergo dispersion after suffering deviation at the interface (The beam is not incident normally on the interface.)
Statement 2 : Vacuum has same refractive index for all colours of white light
Statement-1 : A white parallel beam of light is incident on a plane glass-vacuum interface as shown. The beam may not undergo dispersion after suffering deviation at the interface (The beam is not incident normally on the interface.)
Statement 2 : Vacuum has same refractive index for all colours of white light
physics-General
physics-
For an LCR series circuit, phasors of current i and applied voltage 
are shown in diagram at t =0. Which of the following is/are correct?
For an LCR series circuit, phasors of current i and applied voltage are shown in diagram at t =0. Which of the following is/are correct?
physics-General
physics-
For the given circuit
For the given circuit
physics-General
physics-
A periodic voltage V varies with time t as shown in the figure. T is the time period. The r.m.s. value of the voltage is:-
A periodic voltage V varies with time t as shown in the figure. T is the time period. The r.m.s. value of the voltage is:-
physics-General
physics-
Figure shows a conducting rod of negligible resistance that can slide on smooth U-shaped rail made of wire of resistance 1
/m. Position of the conducting rod at t = 0 is shown. A time t dependent magnetic field B = 2t Tesla is switched on at t = 0
Figure shows a conducting rod of negligible resistance that can slide on smooth U-shaped rail made of wire of resistance 1/m. Position of the conducting rod at t = 0 is shown. A time t dependent magnetic field B = 2t Tesla is switched on at t = 0
physics-General
physics-
STATEMENT–1 : Consider the arrangement shown below. A smooth conducting rod, CD, is lying on a smooth U-shaped conducting wire making good electrical contact with it. The U-shape conducting wire is fixed and lies in horizontal plane. There is a uniform and constant magnetic field B in vertical direction (perpendicular to plane of page in figure). If the magnetic field strength is decreased, the rod moves towards right.
STATEMENT–2 : In the situation of statement-1, the direction in which the rod will slide is that which tends to maintain constant flux through the loop. Providing a larger loop area counteracts the decrease in magnetic flux. So the rod moves to the right independent of the fact that the direction of magnetic field is into the page or out of the page.
STATEMENT–1 : Consider the arrangement shown below. A smooth conducting rod, CD, is lying on a smooth U-shaped conducting wire making good electrical contact with it. The U-shape conducting wire is fixed and lies in horizontal plane. There is a uniform and constant magnetic field B in vertical direction (perpendicular to plane of page in figure). If the magnetic field strength is decreased, the rod moves towards right.
STATEMENT–2 : In the situation of statement-1, the direction in which the rod will slide is that which tends to maintain constant flux through the loop. Providing a larger loop area counteracts the decrease in magnetic flux. So the rod moves to the right independent of the fact that the direction of magnetic field is into the page or out of the page.
physics-General
physics-
Statement-1 : A resistance R is connected between the two ends of the parallel smooth conducting rails. A conducting rod lies on these fixed horizontal rails and a uniform constant magnetic field B exists perpendicular to the plane of the rails as shown in the figure. If the rod is given a velocity v and released as shown in figure, it will stop after some time. The total work done by magnetic field is negative.
Statement-2 : If force acts opposite to direction of velocity its work done is negative.
Statement-1 : A resistance R is connected between the two ends of the parallel smooth conducting rails. A conducting rod lies on these fixed horizontal rails and a uniform constant magnetic field B exists perpendicular to the plane of the rails as shown in the figure. If the rod is given a velocity v and released as shown in figure, it will stop after some time. The total work done by magnetic field is negative.
Statement-2 : If force acts opposite to direction of velocity its work done is negative.
physics-General
