(13)As shown in the right figure, take ε₀ = 18 V, R₁ = 5 Ω, R₂ = 10 Ω, and R₃ = 2.5 Ω. Write the current I₂ immediately after the switch is first closed. (A)1.2 A (B)1.5 A (C)1.8 A (D)2.1 A (E)0.0 A

(13)As shown in the right figure, take ε₀ = 18 V, R₁ = 5 Ω, R₂ = 10 Ω, and R₃ = 2.5 Ω. Write the current I₂ immediately after the switch is first closed.

(A)1.2 A
(B)1.5 A
(C)1.8 A
(D)2.1 A
(E)0.0 A

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(6)A star rotates once every 55 days. It then undergoes a supernova explosion, hurling most of its mass into space. The inner core of the star, whose radius is initially 30 Mm, collapses into a neutron star only 8 km in radius. The rotating neutron star emits regular pulses of radio waves, making it a pulsar. What is the pulse rate (= rotation rate)? (Assume the core to be a uniform sphere & no external torque.) (A)1.39×10⁵ rev/day (B)1.78×10⁵ rev/day (C)2.03×10⁵ rev/day (D)2.28×10⁵ rev/day (E)2.56×10⁵ rev/day

(13)As shown in the right figure, take ε₀ = 18 V, R₁ = 5 Ω, R₂ = 10 Ω, and R₃ = 2.5 Ω. Write the current I₂ immediately after the switch is first closed.

(A)1.2 A
(B)1.5 A
(C)1.8 A
(D)2.1 A
(E)0.0 A

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