Two long parallel straight wires P and Q, seperated by a distance of 10cm in air, carry current of 2A and 5A, respectively, in opposite directions. Then the force, on 20cm length of wire Q, is
(1) 2 x 10-7 N, perpendicular to the length of Q and acts towards P
(2) 2 x 10-6 N, perpendicular to the length of Q and acts away from P
(3) 2 x 10-6 N, and acts towards P
(4) 2 x 10-7 N, and acts away from P