594
13 Electromagnetism I
Fig. 13.14
13.57 A long straight wire carries a current of 20 A, as shown in Fig. 13.15. A
rectangular coil with two sides parallel to the straight wire has sides 5 and
10 cm with the near side a distance 2 cm from the wire. The coil carries a
current of 5 A.
(i) Find the force on each segment of the rectangular coil due to the current
in the long straight wire.
(ii) What is the net force on the coil?
Fig. 13.15
13.58 (a) A very long straight wire PQ of negligible diameter carries a steady
current I 1 . A rigid square coil ABCD of side l and n turns is set up
with sides AB and DC parallel to the coplanar with PQ as shown in
Fig. 13.16. The side of the coil AB is at distance d from the wire PQ.
Derive an expression for the resultant force on the coil when a steady
current I 2 flows through it. What is the direction of the force?
Fig. 13.16
13 Electromagnetism I
Fig. 13.14
13.57 A long straight wire carries a current of 20 A, as shown in Fig. 13.15. A
rectangular coil with two sides parallel to the straight wire has sides 5 and
10 cm with the near side a distance 2 cm from the wire. The coil carries a
current of 5 A.
(i) Find the force on each segment of the rectangular coil due to the current
in the long straight wire.
(ii) What is the net force on the coil?
Fig. 13.15
13.58 (a) A very long straight wire PQ of negligible diameter carries a steady
current I 1 . A rigid square coil ABCD of side l and n turns is set up
with sides AB and DC parallel to the coplanar with PQ as shown in
Fig. 13.16. The side of the coil AB is at distance d from the wire PQ.
Derive an expression for the resultant force on the coil when a steady
current I 2 flows through it. What is the direction of the force?
Fig. 13.16