Yoon Ki investigates electromagnetic induction by moving a bar magnet into a coil of wire. His experimental setup is shown.

Physics

2 answers:

Karolina [17]2 years ago

4 0

A change that would most improve his results would be; D) Connecting the galvanometer to the coil

Snezhnost [94]2 years ago

4 0

Answer: The correct answer is "connecting the galvanometer to the coil".

Explanation:

Electromagnetic induction is the phenomenon of the production of the electromagnetic force across the conductor by changing the magnetic field.

The current can be induced by moving the conductor in the magnetic field. The current can also be induced by changing the magnetic field across the conductor.

The current will be induced into a coil of wire by moving a bar magnet into a coil of wire. It can be observed by connecting the galvanometer to the coil. The galvanometer is an instrument which shows the deflection when the current is flowing in the conductor.

Therefore, the correct option is (D).

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(a) What is the potential between two points situated 10 cm and 20 cm from a 3.0-μC point charge? (b) To what location should th

julia-pushkina [17]

Answer:

(a) 135 kV

(b) The charge chould be moved to infinity

Explanation:

(a)

The potential at a distance of r from a point charge, Q, is given by

$V = -\dfrac{kQ}{r}$

where $k = 9\times 10^9 \text{ F/m}$

Difference in potential between the points is

$kQ\left[-\dfrac{1}{0.2\text{ m}} -\left( -\dfrac{1}{0.1\text{ m}}\right)\right] = \dfrac{kQ}{0.2\text{ m}} = \dfrac{9\times10^9\text{ F/m}\times3\times10^{-6}\text{ C}}{0.2\text{ m}}$