Physics
A current carrying circular loop is lying in a horizontal plane as shown in the diagram. Which of the following is the correct statement with respect to the direction of magnetic lines of force.
- upward at X and downward at Y
- downward at X and upward at Y
- upward at both X and Y
- downward at both X and Y
Electro-Magnetism
3 Likes
Answer
upward at X and downward at Y
Reason — The current in the loop is in clockwise direction. By the right-hand thumb rule, if we curl our fingers in the direction of current, our thumb points along the magnetic field through the loop. For a clockwise current, the field inside the loop (point Y) is downward (into the plane). Magnetic field lines must return outside the loop, so outside (point X) they are in the upward direction (out of the plane).
Answered By
1 Like
Related Questions
According to the NEW international convention, what is the colour coding for the live, neutral and earth wires in household circuits?
- Live – red, Neutral – black, Earth – green
- Live – green, Neutral – yellow, Earth – black
- Live – brown, Neutral – blue, Earth – yellow
- Live – red, Neutral – blue, Earth – yellow
An alloy constantan has resistivity 5 x 10-7 Ω m at 25°C. If the temperature of this alloy is increased to 50°C then its resistivity will be:
- 2.5 x 10-7 Ω m
- 5 x 10-7 Ω m
- 10 x 10-6 Ω m
- 20 x 10-6 Ω m
For a body of mass m the relationship between the heat capacity (C') and specific heat capacity (c) is:
- C' = mc
- C' = c/m
- C' = mc2
- C' = m/c
A piece of a cake and a watermelon of the same mass are taken out of the freezer at the same time. Which of the following statement is correct?
- Cake and watermelon will attain the room temperature at the same time.
- Watermelon will attain the room temperature faster.
- Cake will attain the room temperature faster.
- Which one comes to the room temperature first, depends on the atmospheric pressure at that time.