Question

Julia produces a 2 mA current by moving the south pole of a bar magnet into a solenoid. The solenoid contains 150 loops of wire. Which change should Julia make to generate a larger current

Answer 1

Answer:

1) increasing the number of turns

2) increase the area of the loop

3) by moving the magnet faster

Explanation:

As we know by the Faraday's law that rate of change in magnetic flux linked with the coil will induce EMF

so here we can say that magnetic flux is given as

$\phi = NBA$

now the induced EMF is given as

$EMF = \frac{d\phi}{dt}$

$EMF = \frac{d(NBA)}{dt}$

$EMF = NA\frac{dB}{dt}$

so in order to increase the current we need to increase the EMF

so we can increase it by

1) increasing the number of turns

2) increase the area of the loop

3) by moving the magnet faster

Answer 2

Using more loops of wire in the coil