1. If you double the current in a wire that you use as the detector of an extern

Question

1. If you double the current in a wire that you use as the detector of an external magnetic field, what happens to the force that the magnetic field exerts on it?

     a.) Does not change

     b.) Doubles

     c.) Becgomes half as big

2. You place a metal bar magnet on a swivel and bring a negatively charged plastic rod near the north pole and then near the south pole. What do you observe?

     a.) North pole turn toward rod

     b.) South pole turns toward rod

     c.) Poles do not interact with rods

     d.) both poles are attracted to the rod

3.

Explanation / Answer

1. Force is given by , F = I L B, therefore if current doubles, magnetic force will also doubles

Answer (b)

2. Due to phenomenon of polarisation, bar magnet being metallic, will get attaracted towards both

Answer (d)

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