Question

A U-shaped wire having current is placed in region
of magnetic field as shown in figure, the magnetic
force acting on wire is
(1) ( +2/B
(3) 2Bir
(2) (F-2/)BI
(4) 2Bil​

Answer 1

Answer:

3. 2Bir is the correct answers

Explanation:

magnetic force = B × v × effective length

Answer 2

Given:

• A U - shaped wire having current is placed in the region of the magnetic field as shown in the figure.
• length from where current is placed to the end of the wire is ( l )

To Find: we have to find the force acting on wire is?

First, we have to complete the loop, after completing the loop there will be two forces acting on the wire F1 and F2, and the current will be in a clockwise direction in the loop.

Net force acting on current carrying loop is Zero,

                                         F1 + F2 = 0

                                            F1 = - F2

                                         F2 = î( î×B )

                                               = i (2rB)

                                               = 2irB

                                       | F1 | = | F2 | = 2irB

Hence the force acting on wire is 2irB