Find the force that must be exerted on the rod to maintain a constant current of 0.173 A in the resistor.

Complete Question

Find the force that must be exerted on the rod to maintain a constant current of 0.173 A in the resistor.

The figure below shows a zero-resistance rod sliding to the right on two zero-resistance rails separated by the distance L = 0.451 m . The rails are connected by a , and the entire system is in a uniform magnetic field with a magnitude of 0.751 T .

The diagram illustrating this question is shown on the first uploaded image

The value is  

Explanation:

  From the question we are told that  

   The current is  

    The length of separation is  

     The resistance is  

    The magnetic field is  

Generally the force is mathematically represented as

Given that the velocity is perpendicular to magnetic field then

=>  

So

f=ma newton

f=100x2.5=250n

option number c is the right answer.