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Derive an expression for the torque acting on a current carrying loop suspended in a uniform magnetic field.
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Moving charges and Magnetism - Class 12
According to Fleming's left hand rule, the magnetic forces on sides Pand QR are equal, opposite and collinear (along the axis of the loop), so their resultant is zero. 

The side PQ experiences a normal inward force equal to IbB while the side RS experiences an equal normal outward force. These two forces form a couple which exerts a torque given by  
Moving charges and Magnetism - Class 12
The direction of the torque ττ is such that it rotates the loop clockwise about the axis of suspension.   

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FAQs on Moving charges and Magnetism - Class 12

1. What is the relationship between moving charges and magnetism?
Ans. Moving charges create magnetic fields. When charges are in motion, a magnetic field is generated around them. This phenomenon is known as magnetism.
2. How is magnetism related to electric current?
Ans. Magnetism and electric current are closely linked. When an electric current flows through a conductor, a magnetic field is produced around the conductor. This is the principle behind electromagnets and electric motors.
3. Can static charges create a magnetic field?
Ans. No, static charges do not create a magnetic field. Only moving charges or charges in motion produce a magnetic field. Static charges, on the other hand, only create an electric field.
4. How can moving charges be used to generate electricity?
Ans. Moving charges can be used to generate electricity through electromagnetic induction. When a conductor is placed in a changing magnetic field, it experiences a force that induces an electric current in the conductor. This principle is used in generators and transformers.
5. What are some real-life applications of moving charges and magnetism?
Ans. Moving charges and magnetism have numerous practical applications. Some examples include electric motors, transformers, MRI machines, magnetic levitation trains, and particle accelerators. These applications rely on the interaction between moving charges and magnetic fields to function.
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