1. if a circuit has a total resistance of 24 ohms and 2.5 x 10^23 e charges flow

Question

1. if a circuit has a total resistance of 24 ohms and 2.5 x 10^23 e charges flow past a terminal point in 2.0 minutes, what is the applied voltage?

a. 80.0 V       b. 9.00 V           c. 12.0 V            d. 8010 V

2. An atom has 97 protons and 251 nucleons. If it undergoes alpha decay, what are the number of protons and neutrons, respectively, in the daughter nucleus?

a. 96,245     b. 94,247        c. 95,249       d. 100,249

3. a magnetic flux of 50 Wb increases to 100 Wb in 10 seconds, what is the induced emf?

a. 10.0 V    b. no emf is induced        c. 5.0 V             d. 12.0 V

Explanation / Answer

I= Q/t

q= 2.5*10^23 *1.6*10^-19 =40000

t=2*60 =120

I= 40000/120 amps

V=IR = 40000/120*24 =8000V

d

2.

Aplha is 2 protons and 2 neutrons hence daughter nucleus = 95 protons and 249 neutrons

c

3

EMF = d(flux)/dt = (100-50)/(10-0) = 5V

c

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