The figure shows three identical lightbulbs connected to a battery having a its

Question

The figure shows three identical lightbulbs connected to a battery having a its terminals. What happens to the brightness of lightbulb 1 when the switch S is closed A) The brightness decreases permanently. B) The brightness will decrease momentarily then return to its previous level. C) The brightness remains the same as before the switch is closed. D) The brightness increases permanently. E) The brightness will increase momentarily then return to its previous level. A wire along the x-axis has current of 8.8 amperes in positive x-direction. Find the force on a 7.4 cm long wire by the uniform magnetic field of 0.23 Tesla in the y-direction A) 2.02 N B) 0.15 N C) 15 N D) 0.65 N Consider a solenoid of length L, N windings, and radius b (L is much longer than b). A current I is flowing through the wire. If the length of the solenoid became twice as long (2L), and all other quantities remained the same, the magnetic field inside the solenoid would A) remain the same. B) become twice as strong. C) become one half as strong. A long solenoid 2.13 meters long and 2.75 cm in diameter, carries a current of 7.75 A. It consists of 10 closed packed layers each with 750 turns along the length. What is the magnetic field at its center? A) 2.73 times 10^-3 T B) 8.57 times 10^-3 T C) 2.73 times 10^2 T D) 3.43 times 10^-2 T At what rate would the current in a 100-mH inductor have to change to induce an emf of 100 V in the inductor? A) 10 A/s B) 1,000 A/s C) 10,000 A/s D) 1 A/s E) 100 A/s An electric field of 1.50 kV/m and a magnetic field of 0.40 T act on a moving electron and produce no net force. Calculate the minimum speed of the electron. A) 3.75 times 10^3 m/s B) 3.75 times 10^-3 m/s C) 2.75 times 10^-3 m/s D) 1.5 times 10^3 m/s

Explanation / Answer

Ans 13= when the swich s is closed then bulb 2 an3 are in parallel , that means the resistance of the circuit decreases and as per the ohms law current increases. since bulb 1 is in series with battery so power delievered to bulb 1 is more. so the brightness increase permanantly. ANS is D

Related Questions

Navigate

• Browse (All)
• Browse T
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.