Multiple Choice Questions series The potential across the 40.02 resistor i 1) 10

Question

Multiple Choice Questions series The potential across the 40.02 resistor i 1) 10.02 and a 40.02 connected in resistor 5.00 V. What is the are the 10.02 current through (A) 0.500 A (B) 0.250 A (C) 0.100 A (D) 0.125 A 2) A +4.0HC charge is brought from a long distance to a distance of 3.0 meters fron (A) 7.2 charge. What is the energy required to assemble this charge distribution x (B) 7.2 x 10-8 J (C) 2.4 x 10-8 J (D) 2.4 x 10 2 J Figure 1: An electron has a velocity in the positive y direction and it experiences a

Explanation / Answer

(1) ans

Given that

resistance R1=10 ohm

resistance R2=40 ohms

potential across the resistance R2=5 v

now we find the current on 10 ohms

here the resistance are series connection so the current is same for all resistance

current I=5/40=00.125 A

the correct option is D

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(2) ans

charge q1=6*10^-6 C

charge q2=4*10^-6 C

distance r=3 m

now we find the energy stored in the charges

the energy stored U=kq1q2/r=9*10^9*6*4*10^-12/3=0.072 J

the correct option is A

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(3) ans

basing on the fleming left hand rule the magnetic field is +Y-axis

(4) ans

number of turns N=1250 turns

breath b=10 cm

length L=15 cm

current i=2.25 A

magnetic field B=5*10^-5 T

now we find the torque

torque =nL*b*iB=1250*10*15*10^-4*2.25*5*10^-5=2.11 mN.m

the correct option is B

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