Question

At one instant an electron(charge = -1.6 x 10-19 C)is moving in the xy plane ,...

At one instant an electron(charge = -1.6 x 10-19 C)is moving in the xy plane , the components of its velocity beingvx = 3.0 x 105 m/s and vy=4.0x105m/s. A magnetic field of 0.8T is in the positivez direction. At that instant the magnitude of the magnetic force onthe electron is ....
(a) 0
(b) 2.9 x 10-14 N
(c) 3.8 x 10-14 N
(d) 4.8 x 10-14 N
(e) 6.4x10-14 N
0 0
Add a comment Improve this question Transcribed image text
✔ Recommended Answer
Answer #1
v =vxi+vyj =3.0 x 105i +4.0x105j m/s

B = 0.8 k

q =
-1.6 x 10-19 C

F = q(v X B)=
-1.6 x10-19(3.0 x105i + 4.0x105j) X 0.8 k
=
-1.6 x 10-19 *3.0 x 105 *0.8(-j) + -1.6 x10-19 *4.0x105*0.8(-i)
= 3.84 x 10-14j + 5.12 x10-14i [ Sincei X k = -j andj X k = -i]

∴ |F| = √[( 3.84 x 10-14)2 +(5.12 x10-14)2] = 6.4 x10-14 N

Add a comment
Know the answer?
Add Answer to:
At one instant an electron(charge = -1.6 x 10-19 C)is moving in the xy plane ,...
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Similar Homework Help Questions
ADVERTISEMENT
Free Homework Help App
Download From Google Play
Scan Your Homework
to Get Instant Free Answers
Need Online Homework Help?
Ask a Question
Get Answers For Free
Most questions answered within 3 hours.
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT