Question

Two conducting rails are connected to a source of emf and form an incline as shown in figure. A bar of mass 50 g slides without friction down the incline through a vertical magnetic field B. If the length of the bar is 50 cm and a current of 2.5 A is provided by battery. Value of B for which the bar slide at a constant velocity ______ × 10^-1 Tesla. 2 [g = 10 m/s²]

पर्याय

• 0.20

• 0.30

• 0.40

• 0.50

Answer 1

Two conducting rails are connected to a source of emf and form an incline as shown in figure. A bar of mass 50 g slides without friction down the incline through a vertical magnetic field B. If the length of the bar is 50 cm and a current of 2.5 A is provided by battery. Value of B for which the bar slide at a constant velocity 0.30 × 10^-1 Tesla. 2 [g = 10 m/s²]

Explanation:

F cos θ = Mg sin θ 

BI Lcos θ = Mg sin θ 

B = `"Mg"/"IL"` tan θ

= 0.3

= 3 × 10^–1 Tesla