Question
If the resultant torque of all the forces acting on a body is zero about a point, is it necessary that it will be zero about any other point?
✓
Answer
No, it is not necessary that the torque about any other point be zero if it is zero about one point. Let $\overrightarrow{\text{F}}$be the resultant force due to all the forces acting on the plane of the body. Therefore, torque due to force $\overrightarrow{\text{F}}$ at any point will be the resultant torque. Now, we see that the torque due to $\overrightarrow{\text{F}}$ at point Q will be zero because Q lies on the line of support of the force F but the torque due to force $\overrightarrow{\text{F}}$ will not be zero along the point P.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
When a 200 gm piece of metal is weighed in pure water, its weight is 160 gm. Find the relative density of the metal and the volume of the piece.
A block of massip, sliding on a smooth horizontal surface with a velocity $\vec{\text{v}}$ meets a long horizontal spring fixed at one end and having spring constant k as shown in figure. Find the maximum compression of tin spring. Will the velocity of the block be the same $\vec{\text{v}}$ when it comes back to the original position shown? 
→What do you mean by inertia of motion? Give an example to illustrate it.
A 10m wide spacecraft moves through the interstellar space at a speed $3 \times 10^7m/s^{-1}$. A magnetic field $B = 3 \times 10^{-10}T$ exists in the space in a direction perpendicular to the plane of motion. Treating the spacecraft as a conductor, calculate the emf induced across its width.
→According to Maxwell's theory of electrodynamics, an electron going in a circle should emit radiation of frequency equal to its frequency of revolution. What should be the wavelength of the radiation emitted by a hydrogen atom in ground state if this rule is followed?
Ultrasonic waves of frequency 4.5MHz are used to detect tumour in soft tissues. The speed of sound in tissue is 1.5km/s and that in air is 340m/s. Find the wavelength of this ultrasonic wave in air and in tissue.
The length of steel wire got increases by 0.25 cm by hanging a weight of 2.5 kg . Find the work done in pulling the wire $\left(g=10 m / s ^2\right)$
→A cricket bat is cut through its centre of mass into two parts as shown 
Then, state whether both parts are of same mass or not. Also, give reason.
Then, state whether both parts are of same mass or not. Also, give reason.A copper wire of diameter 1.6 mm carries 20A. Find the maximum magnitude of the magnetic field $\overrightarrow{\text{B}}$ due to this current.
→A tightly-wound, long solenoid has n turns per unit length, a radius r and carries a current i. A particle having charge q and mass m is projected from a point on the axis in a direction perpendicular to the axis. What can be the maximum speed for which the particle does not strike the solenoid ?