1
COMEDK 2020
MCQ (Single Correct Answer)
+1
-0

A horizontal overhead power line carries a current of 90 A in East to West direction. What is the magnitude and direction of the magnetic field due to the current, 1.5 m below the line?

A
1.2 $$\times$$ 10$$^{-5}$$ T, towards South
B
1.2 $$\times$$ 10$$^{-5}$$ T, towards North
C
1.2 $$\times$$ 10$$^{-5}$$ T, towards East
D
1.2 $$\times$$ 10$$^{-5}$$ T, towards West
2
COMEDK 2020
MCQ (Single Correct Answer)
+1
-0

A moving coil galvanometer has 28 turns and area of coil is $$4\times 10^{-2}$$ m$$^2$$. If the magnetic field is 0.2 T, then to increase the sensitivity by 25% without changing area and field, the number of turns should be changed to

A
24
B
35
C
60
D
54
3
COMEDK 2020
MCQ (Single Correct Answer)
+1
-0

The intensity of magnetic field due to an isolated pole of strength $$m_p$$ at a point distant $$r$$ from it will be

A
$$m_p/r^2$$
B
$$m_p r^2$$
C
$$r^2/m_p$$
D
$$m_p/r$$
4
COMEDK 2020
MCQ (Single Correct Answer)
+1
-0

The particle that cannot be accelerated by a cyclotron is

A
proton
B
$$\alpha$$-particle
C
electron
D
deuteron nucleus
EXAM MAP