A uniform magnetic field of 1.5T exists in a cylindrical region of radius 10.0 cm, its direction being parallel to the axis along east to west. A current carrying wire in north-south direction passes through this region. The wire intersects the axis and experience a force of 1.2N downwards. If the wire is turned from north south to northest-southwest direction. then magnitude and direction of force is

Options

A. 1.2 N, upward
B. `1.2sqrt2`, downward
C. `1.2N`, downward
D. `1.2/(sqrt2)N`, downward

Answer

C

Explanation

Initially: `1.2N=1(veclxxvecB)` downward
In the given condition:
`F=I l/(sin theta)B sin theta=IlB=1.2N down ward`