Recently Active Physics Questions

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*Image* Ans) is -12 v/m bt it shld be 12 v/m na...?? ...

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A small box is placed on a conveyor belt that moves with constant speed v0=1m/s . Due to a technical malfunction, the belts starts moving left and right at constant speed (see the graph below). The coefficient of kinetic fric ...

A square loop of side length ' a ' , mass ' m ' and Resistance ' R ' enters a uniform magnetic field (B=B0 (-k)) with velocity ' v° ' at t = 0 sec Plot the variation of ' v ' with the distance from O ( Assume that ' v ' is e ...

In a meter bridge experiment, the resistance to be measured is connected in the right gap and a known resistance in the left gap has a value of 50±0.2 Ω when the null point is judged to be at 60±0.2 cm. The student notes t ...

A micrometer screw gauge with pitch of 0.5 mm and 50 divisions on circular scale is used to measure the diameter of a thin wire. Initially, when the gap is closed, the fourth division coincides with the reference line. Three ...

A disc of radius R and mass M is projected on to a horizontal floor with a backward spin such that it's speed of centre of mass is v and angular velocity is ω .What must be the minimum value of ω so that the disc eventually ...

Two thin convex lenses of focal lengths f1 and f2 are separated by a horizontal distance 'd' ( where f1 and f2 are greater than 'd') and their centres are displaced by a vertical separation 'δ'...Taking the origin of co-ordi ...

A point source 'S' is placed at a height 'h' from the bottom of a vessel of height 'H'(where h is greater than H)..The vessel is polished at the base ..Water is gradually filled in the vessel at a constant rate of α m3/s. Th ...

Consider a usual set-up of Young's Double Slit Experiment with slits of equal intensity. Take 'O' as origin and Y-axis as the screen..If the average intensity between y1 = -(λ.D)/(4d) and y2 = +(λ.D)/(4d) equals 'n' times t ...

The door of a running refrigerator inside a closed room was left open.Then- (a)The room will be cooled slightly (b)The temperature of the room will be lowered (c)The temperature of the room will not be affected (d)The room wi ...

Prove that mechanical energy is conserved when a body is thrown upwards. Please help me! My exam starts in two days and I need this answer by Friday. IT'S EXTREMELY URGENT. ...

The value of gas constant R for hydrogen is- (a)1/2 calorie (b)2 calories/mole Kelvin (c)4 calories (d)1 calorie Please explain how??? ...

In given gas,sound travels at a speed of 300m/s.Find the order of the root-mean-square velocity of the molecules of this gas- (a)40m/s (b)400m/s (c)4000m/s (d)4m/s ...

Solid Cylinder, rolls over horizontal surface Find the max value of v which still permits it to roll over incline plane without a jump, sliding is absent. *Image* ...

A free point charge q and mass m is at rest at the origin .A constant electric field E = E0(i^- j^) and constant magnetic field B = -B k^ is present in whole region .When this charge reaches at position (2,20) its speed be ∠...

A thin slice is cut out of glass cylinder along a plane parallel to its axis ..The slice is placed on a flat plate (just as a bowl is placed on a table)..the observed interference fringes from this combination shall be??????? ...

*Image* What is the net resistance in the circuit? Current flows from the direction of the resistor R1 to the resistor R4. Give suitable reasons with your answer. ...

a uniform rod of mass m and length l rotates in a horizontal plane with an angular velocity ω about a vertical axis passing through one end .The tension in the rod at a distance x from the axis is? ...

An ice cube contains an iron ball in it and floats in water contained in a vessel.What will happen if the ice melts away? a. The water level will go up. b. The water level will go down c. There will be no change in the water ...

A ball is rolling without slipping in a spherical shallow bowl as shown and executing SHM. If radius of the ball is doubled, the period of oscillation *Image* A) increases slightly B) is reduced by a factor of 1/2 C) is incre ...

two masses A and B of 10kg and 5kg respectively are connected with a string passing over a frictionless pulley fixed at the corner of a table as shown. The coefficient of static friction of A with the table is 0.2. The minimu ...

A plank is resting on a horizontal ground in the northern hemisphere of the earth at 45° latitude. Let the angular speed of the earth be ω and its radius be re. The magnitude of the frictional force on the plank will be A. ...

If the force exerted by 2 charges of 2μC and x C separated by a distance of 25 cm equals the force exerted by a current carrying conductor of 9A in a magnetic field of 32 Tesla and of length 50 cm at angle 30. Then find the ...

Find the force exerted when Current is 5, Magnetic Field Strength is 4 and length is 1/2 m. ...

*Image* Please give ans with solution ...

A steady current I flows through a wire of resistivity ρ, length L and radius r. The current produces heat in the wire. The rate of heat loss in the wire is proportional to its surface area. The steady temperature of the wir ...

The long straight wire carrying a constant current 'i' is placed distance 'd' above a metal bar of length 'l' which is moving at constant velocity V in the horizontal direction .Calculate the E.M.F induced in the bar? ...

What is the time constant for the circuit..how to calculate? ...