Question

. Fig shows, a battery is connected to screw with the help of conducting wire. A magnetic
needle is placed near the screw.
(i) If screw is made of Cu then deviation in needle is x.
(ii) If screw is made of Al then deviation in needle is y.
(iii) A new screw is made whose resistance is equal to parallel combination of two screws
made of Cu and Al. If this screw is used in circuit then deviation in magnetic needle is z.

Answer 1

Explanation:

. Fig shows, a battery is connected to screw with the help of conducting wire. A magnetic

needle is placed near the screw.

(i) If screw is made of Cu then deviation in needle is x.

(ii) If screw is made of Al then deviation in needle is y.

(iii) A new screw is made whose resistance is equal to parallel combination of two screws

made of Cu and Al. If this screw is used in circuit then deviation in magnetic needle is z.