Palak took cardboard within 2 holes and inserted a circular coil having n number of turns through them. She connected the ends of coil in series with a battery and sprinkled iron filings on the cardboard and plugged the key.
1. On what factor does magnetic field produced by a current-carrying wire depend on?
a. Current passing through it
b. Iron filings distributed on the cardboard
c. Temperature of the coil
d. Air passing through it
2. Current in each turn has different direction. True or false?
a. TRUE
b. FALSE
3. How can we increase the magnetic field in this apparatus?
a. By increasing temperature of the surrounding
b. By changing the wire
c. By decreasing the number of turns of the loop
d. By increasing the number of turns of the loop
4. What is the nature of field lines at the centre of circular wire?
a. Pyramid structure perpendicular to the plane of coil
b. Grid like on the plane of the coil
c. Straight and perpendicular to the plane of coil
d. Zigzag lines on the plane of coil
5. The strength of magnetic field is ____ proportional to the radius of the wire.
a. Directly
b. Inversely
c. Diagonally
d. Circularly
