question_answer

A conducting rod of 1 m length and 1 kg mass is suspended by two vertical wires through its ends. An external magnetic field of 2 T is applied normal to the rod. Now the current to be passed through the rod so as to make the tension in the wires zero is [Take\[g=10\text{ }m{{s}^{-2}}\]]

A)  0.5 A                                    

B)  15 A                     

C)  5 A                        

D)         1.5 A

E)  2.5 A