Question

A question about the amplitude graph of the pendulum:
Should I say; Period does not depend on Amplitude and just make a zero slope graph just like the mass graph.

OR

Should I say; The time period of a pendulum changes as the amplitude changes, but change is negligible if the amplitude is very small. Period only depends on amplitude, if the amplitude isn't very small and make a positive slope graph that represents a slight change as the amplitude of pendulum increases.

Q2: What's the maximum amplitude of a 0.71m pendulum is it 90° or 180°?

Q3: As a negative test charge moves farther from a negative charge in an electric field, the potential energy?

a.decreases.
b. increases.
c. doubles.
d. remains the same.

Q4: If a magnetic field points upward and the current is to your left, the force is.

a. toward you
b. to your right
c. away from you
d. to your left

Q5: A device used to measure both magnitude AND direction of an electric current is a(n)

a. ammeter.
b. galvanometer.
c. voltmeter.
d. ohmmeter.

Q6: The current is least in a rotating loop when the loop’s motion is __________ the magnetic field.

a. slow and perpendicular to
b. slow and parallel to
c. fast and perpendicular to
d. fast and parallel to

Q7: The force on a test charge in an electric field is __________ the magnitude of the field.

a. inversely proportional to
b. directly proportional to
c. inversely proportional to the square of
d. unrelated to

Answer 1

The time period of a pendulum changes as the amplitude changes, but change is negligible if the amplitude is very small. Period only depends on amplitude, if the amplitude isn't very small and make a positive slope graph that represents a slight change as the amplitude of pendulum increases.

___________________________________

As a negative test charge moves farther from a negative charge in an electric field, the potential energy

It is given as

U = kq1q2 / r

so,

if we increase the distance, the potential energy will decrease

_______________________________

If a magnetic field points upward and the current is to your left, the force is

use the right hand rule, force will be away from us.

__________________________

A device used to measure both magnitude AND direction of an electric current is

Galvanometer

Reason - The most significant difference between the galvanometer and ammeter is that the galvanometer show both the direction and the magnitude of the current, whereas the ammeter only shows the magnitude of the current.

________________________________

The current is least in a rotating loop when the loop’s motion is __________ the magnetic field.

when it is moving parallel to magnetic field in a way that there is no change in flux

_____________________________

The force on a test charge in an electric field is __________ the magnitude of the field

we know

F = qE

so,

It is directly proportional