question_answer

A boy set up an experiment as shown in the diagram. As he slide the magnet across the wooden board, the ball bearing followed the magnet's movement and direction. What does the experiment show?

(i)  Magnetic force can be seen due to friction between ball bearing and wooden board.

(ii) Friction and gravity help to move the ball bearing.

(iii) The ball bearing is made of a magnetic substance.

(iv) Magnetic force can pass through the wooden board.

A) (i) and (ii)

B) (iii) and (iv)

C) (i), (iii) and (iv)

D) (ii), (iii) and (iv)