Point charges +4.00 muc and +2.00 muc are placed at the corners of a as shown in

Question

Point charges +4.00 muc and +2.00 muc are placed at the corners of a as shown in the figure.due to these chargee? (k=1/4piepsilon0 = 8.99 times 10^9 n m^2/c^2) A proion moving coward with a velocity of 5.0 km's enters a magnetic field of0 20 T jwintmg northward. What arc the magnitude and direction of the force that the magnetic field exerts on the proton? 0 N 1.6 times 10^-16 N upwards 1.6 times 10^-16 N downwards 1.1 times 10^-16 N eastwards 4.4 times 10^-16 N westwards A proton that is initially at rest is accelerated through an electric potential difference of magnitude 500 V. How much kinctic energy docs it gain? (e = 1.60 times 10^-19)

Explanation / Answer

V= kQ/r

where k=8.99 * 109N.m2/C2

Q=charge

r=distance

V(A) = k*4C/0.8 + k*2C/0.4 = 8.99 * 109 (4*10-6/0.8 + 2*10-6/0.4) = 8.99 * 104 = 89.9 kV

Hence option C is correct

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Ans 7)

v=5Km/s = 5*103m/s

B=0.20T

q=charge on proton = 1.6*10-19C

we know force exerted on moving charge in magnetic field can be found using the formula

F=qvB =  1.6*10-19C *  5*103m/s * 0.20T =1.6 * 10-16N

for finding the direction we have to use Fleming right hanb rule. and get direction force Upwards

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