Which of the following statements are true?
Check all that apply.
a. A voltmeter is used to measure voltage.
b. A voltmeter has a small internal resistance.
c. A voltmeter must be placed in parallel with a resistor to measure the voltage across the resistor.
d. An ammeter must be placed in parallel with a resistor to measure the current through the resistor.
e. An ammeter is used to measure current.
f. An ammeter has a large internal resistance.

Which type of electromagnetic waves are dangerous enough to be used to kill cancerous cells? (a)gamma rays (b)visible light (c)infrared light (d)microwaves

Avolcano erupts next to a grassland area in a valley. a. describe three ways in which material released by the volcano could impact the grassland area. b. describe three ways in which the grassland ecosystem could recover after a volcanic eruption.

Two 1.20-m nonconducting wires meet at a right angle. one segment carries + 2.50 µc of charge distributed uniformly along its length, and the other carries - 2.50 µc distributed uniformly along it, as shown in fig. 21.50. ( a. find the magnitude and direction of the electric field these wires produce at point p, which is 60.0 cm from each wire. ( b. if an electron is released at p, what are the magnitude and direction of the net force that these wires exert on it?