Aconducting loop around a bar magnet begins to move away from the magnet. which of the following statement(s) is/are true when this occurs? (i) the magnet and the loop repel one another (ii) the magnet and the loop attract one another (iii) the magnetic field generated by the induced current opposes this motion (iv) the magnetic field generated by the induced current assists this motion

(ii) The magnet and the loop attract one another

(iii) The magnetic field generated by the induced current opposes this motion

Explanation:

This situation can be explained by using Lenz's law, which states that the induced emf in the loop will have a direction such that the magnetic field generated by the loop will oppose the change of flux linkage undergoing through the loop.

In this situation, the loop is moving away from the bar magnet: this means that the flux linkage through the loop is decreasing. So, the emf induced in the loop will have a direction such that, the magnetic field produced by the current in the coil will oppose this decrease in flux linkage: as a result, the direction of the field will be such that the magnetic force exerted by the loop on the magnet will be attractive, and the loop will slow down in the motion.

So, the correct statements are

(ii) The magnet and the loop attract one another

(iii) The magnetic field generated by the induced current opposes this motion

the best answer for these questions would be:

1.            c. is smaller

2.            d) concrete operational

3.            b) interaction with the environment – the children interact with their environment can them learn more.

4.            a) parents who reason openly with children can limit a child’s cognitive ability.