Question

3. The strength of a magnetic field due to a solenoid can be increased by
a. increasing the number of turns in the solenoid.
b. increasing the current in the solenoid.
c. winding the solenoid around a magnetic material.
d. all of these
4. Which of these appliances does not use an electromagnet?
a. washing machine b. refrigerator c. room heater
5. Which of these is absolutely necessary in an electric circuit?
a. bulb
b. switch
c. voltmeter
6. The same current is passed through the following. Which will show the s
strength?
b. coil of wire
a. straight conducting wire
d. solenoid wound on an
c. solenoid wound on a wooden core​

Answer 1

Answer:

3d 4a 5b 6b

Explanation:

thodi budi de lun benchodo

Answer 2

Explanation:

strength of magnetic field can be increased by d)all

do not use electro magnet a)washing machine

necessary in circuit)b switch

same strength b straight conducting wire