How To Find Direction Of Torque: Detailed Explanations And Problem 


In this article, we will discuss how to find direction of torque and other aspects of it.  

The right-hand grasp rule is used to determine the path of the torque vector. The torque vector points in the plane of the thumb if a hand is wrapped around the plane of rotation with the fingers oriented in the force vector. 

Torque is a measurement of the force required to spin an item around an axis. In linear kinematics, the force causes an object to accelerate; in angular kinematics, torque enables an entity to accelerate. Torque is a parameter that is measured as a vector. The torque vector’s orientation is determined by the force acting on the axis. 

Torque is intuitively understood by everyone who has ever opened a door. When opening a door, the individual pushes on the side of the door that is furthest from the hinges. It takes a lot more power to push on the side closest to the hinges. Despite the labour being equal in both circumstances (the bigger force is delivered over a shorter radius), individuals prefer to use less force, which is why the door handle is usually located in the middle. 

The term “static torque” refers to a torque that does not create an angular acceleration. Since the door does not rotate on its hinges regardless of the force provided, someone pushing on it applies a static torque to it. Since they’re not accelerating, somebody pedalling a bicycle at a steady pace is likewise applying a static torque. 

A kinetic torque is carried by the gear shaft of a sports vehicle speeding from the starting position since it must produce an angular acceleration of the wheels provided that the car is moving along the course. The vocabulary used to describe torque can be a bit perplexing. Scientists frequently use the terms moment and moment of force indiscriminately. The moment arm refers to the radius where the force operates. 

For a rotating system, the idea of rotational equilibrium is identical to Newton’s first law. Without being acted on by an outside torque, an item that is not spinning stays that way. Similarly, unless acted on by an external torque, a body rotating at steady angular velocity will continue to rotate. 

When dealing with difficulties with several torques operating on a rotating item, the idea of rotational equilibrium comes in handy. In this scenario, it’s the net torque that matters. If a rotatable object’s net torque is nil, it will be in rotational equilibrium and unable to gain angular acceleration. 

How to find direction of torque in electric field? 

To determine the torque generated by a dipole in an outside field, imagine a dipole positioned in a homogeneous outside field ‘E’. 

The positive charge will be exposed to an electric pressure in the upper axis of ‘qE’ value, whereas the negative charge will be exposed to an electric force in the downwards way of ‘qE’ value. 

The dipole may be seen to be in transitional equilibrium since the net pressure is zero. What, on the other hand, is the rotational equilibrium? The dipole may stay stationary in this case, but it spins with a given angular velocity. This has been shown empirically, indicating that both electrostatic pressures (qE) act as clockwise torque. 

As a response, the dipole revolves when placed in a homogeneous outside electric field. Usually, remember that torque is always applied in pairs. Its magnitude is also the consequence of the combination of force and arm. The space separating the place where pressure is given and the place at which dipole rotates may be referred of as the arm. 

How to find direction of torque in magnetic field? 

In the same manner that the torque generated on an electric dipole was computed, the torque vector can also be determined from the magnetic dipole moment: 

  

The loop is turned by the magnetic field, and the top section is inserted onto the page. Folding our fingers in that way causes torque to be applied to the left. The cross-product of magnetic moment and field determines the torque distribution. 

Science is an odd topic that rarely fails to astonish you as new topics are introduced. We’re all aware that charge exists all around us and that it creates a wide range of natural phenomena. Moreover, positive and negative charges come in a variety of shapes and sizes, each with its own set of properties when exposed to a stimulating field. 

Have you heard the word “electric dipole” before? This odd arrangement of positive and negative electric charges generates a fascinating physics concept. A dissociation of positive and negative charges is referred to as an electric dipole. 

Imagine a pair of contrary signs but equal-magnitude electric ions dispersed by a significantly shorter distance. Our current emphasis is on the behaviour of an Electric Dipole in the appearance of an outside field. While going on to the features of the torque operating on an electric dipole in a homogeneous electric field, let’s recap the features of the torque operating on an electric dipole in a homogeneous electric field. 

While a dipole is put in a non-uniform electric field, why does it feel both force and torque 

Whenever a dipole is placed in a uniform electric field, each charge gets a force because the dipole vector orientation is not parallel to the field orientation. These forces have the same strength, yet they are flowing in opposite directions. These equal and opposing parallel pressures create a pair.

The dipole is torqued by this pair, which causes it to spin and alignment in the field plane. In a uniform field, though, the force usually is nil. Whenever a dipole is placed in a non-uniform field, as previously indicated, there will be a torque.

After the dipole is oriented to the field axis, the forces operating on the charges are not identical. As a consequence, the dipole will experience a net force in the field-increasing direction. As a consequence, the electric dipole is subjected to non-uniform torque and force. 

Problems 

Problem 1 

Two small electrical dipoles, AB and CD, with dipole moments of “p” each, are kept at a 120° angle. As a response, what is the dipole moment? If E is oriented in the +x direction, what is the quantity and direction of torque acting on this structure? 

Ans. AB and CD have the same functional dipole moment, that is

Pe=√p2+p2+2ppcos1200

⇒Pe=√2p2+2p2(-1/2)

 ⇒P

Because the resulting vector forms a 30° angle with the x-axis, the torque felt by the functional dipole is increased,  

τ=pEsinθ

τ=1/2pE

It operates on the z-axis. 

As a result, the functional dipole moment is p, and the program’s torque is 1/2pE in the +z axis. 

Frequently asked questions | FAQs 

Ques. What does the term “torque orientation” imply? 

Ans. The torque is in the orientation of the angular velocity that it would create if no other factors were present. The shift in angular velocity is usually in the torque’s orientation. 

Ques. Is it possible to have a positive torque in the anti-clockwise direction? 

Ans. Each force acting clockwise has a positive torque, while each force acting anticlockwise has a negative torque. When the distance, force, or orthogonal components are all larger, the torque is also higher. 

Ques. Torque is either a force or a moment. 

Ans. Torque, also known as force moment, is the propensity of a force to spin the object to which it is exerted in physics. 

 Ques. What is the definition of a clockwise torque? 

Ans. A negative torque is one that turns an item clockwise. 

Ques. Where does the torque vector’s direction come from? 

Ans. The orientation of the torque vector is determined by how the applied force causes the system to rotate. The wrench is turning known as anti-clockwise in this case. 

Also, please click to know about How To Calculate Torque From Rpm.

SAKSHI KM

I am Sakshi Sharma, I have completed my post-graduation in applied physics. I like to explore in different areas and article writing is one of them. In my articles, I try to present physics in most understanding manner for the readers.

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