If current carrying coil put in mag fieldwhich is normal to its plane.what is torque.please tell me here concept of angle by complete diagram

Plzz look at Fig. 27.32 in the follwing link :

http://www.physics.sjsu.edu/becker/physics51/mag_field.htm

The right-hand rule determines the direction of the magnetic moment of a current-carrying loop. This is also the direction of the loop's area vector A; the loop's magnetic moment is m = I A.

TORQUE

t = m x B

From the right-hand rule we see that the torque vector t is directed into the page or screen. The torque tends to rotate the solenoid in a clockwise direction.

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regards

Ramesh