Ask a Doubt
Request a call back

Join NOW to get access to exclusive study material for best results

CBSE Class 12-science Answered

An electron is projected horizontally with kinectic energy 10 kev. A magnetic field of strength 1*10^7 T exists in the vertically upward direction. Calculate the sideways deflection of the electron in travelling through 1 metre.
Asked by rohit | 21 Jul, 2015, 02:13: AM
answered-by-expert Expert Answer
begin mathsize 12px style straight K. straight E. equals 10 space keV equals 1.6 cross times 10 to the power of negative 15 end exponent space straight J Magnetic space field comma space straight B equals 1 cross times 10 to the power of negative 7 end exponent space straight T Since comma space magneti space field space is space vertically space upward space hence comma space its space direction space found space by space using space right minus hand space screw space rule. Hence comma space the space electron space get space directed space towards space left. Kinetic space energy equals 1 half mv squared straight v equals square root of fraction numerator KE cross times 2 over denominator straight m end fraction end root space space space space space space space space left parenthesis straight i right parenthesis Magnetic space force space iis space given space as comma space straight F equals Bqv space space space space space left parenthesis ii right parenthesis and space straight F equals ma space space space space space left parenthesis iii right parenthesis from space left parenthesis ii right parenthesis space and space left parenthesis iii right parenthesis ma equals Bqv straight a equals Bqv over straight m Applying space eqution space of space motion comma straight s equals ut plus 1 half at squared As space there space is space no space force space acting space on space the space electron space in space the space horizontal space direction comma space the space velocity space of space the space electron space remain space constant space in space this space direction. space So comma space the space time space taken space to space cross space straight a space distance space of space 1 straight m space in space the space horizontal space direction space in space the space magnetic space field space is straight t equals straight x over straight v Substituting space all space values space in space equtions space of space motion comma straight s equals 1 half cross times Bqv over straight m cross times open parentheses straight x over straight v close parentheses squared equals fraction numerator qBx squared over denominator 2 mv end fraction equals fraction numerator qBx squared over denominator 2 straight m square root of fraction numerator KE cross times 2 over denominator straight m end fraction end root space space end fraction straight s equals 1 half cross times fraction numerator 1.6 cross times 10 to the power of negative 19 end exponent cross times 1 cross times 10 to the power of negative 7 end exponent cross times 1 squared over denominator 9.1 cross times 10 to the power of negative 31 end exponent cross times square root of begin display style fraction numerator 1.6 cross times 10 to the power of negative 16 end exponent cross times 2 over denominator 9.1 cross times 10 to the power of negative 31 end exponent end fraction end style end root end fraction straight s equals 0.0148 space straight m end style
Answered by Priyanka Kumbhar | 21 Jul, 2015, 03:33: PM

Concept Videos

Multiple Choice Questions Practice Test
Answered Unanswered My Questions My Answers
CBSE 12-science - Physics
state biot savart law
Asked by himanshurawat5823 | 08 Mar, 2024, 01:24: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
Answer this:  Assertion (A): When radius of a circular loop carrying a steady current is doubled, its magnetic moment becomes four times.  Reason (R): The magnetic moment of a circular loop carrying a steady current is proportional to the area of the loop.  Select the correct answer from the codes (a), (b), (c) and (d) as given belote.  (a) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).  (b) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).  (c) Assertion (A) is true, but Reason (R) is false.  (d) Assertion (A) is false and Reason (R) is also false.
Asked by anubhutiupadhaya | 06 Mar, 2023, 04:23: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
PLEASE SOLVE IT
question image
Asked by rd0543293 | 19 Jun, 2022, 10:51: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
How much energy is stored in a 3 cm diameter, 12 cm long solenoid that has 200 turns of wire and carries a current of 0.8A?
Asked by arjunsah797 | 26 Mar, 2022, 09:10: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
Please refer to the uploaded image for the doubt
question image
Asked by arjunsah797 | 16 Mar, 2022, 02:07: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
ampere law
Asked by shantanumail24 | 09 Mar, 2022, 07:04: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
As we know, work done by Magnetic force is always zero in moving a charged particle./So it cannot change speed of charged particle. MY doubt is that, can magnetic force change direction of motion of charged particle?
Asked by yashrajgharte24.12dgatl | 25 Oct, 2021, 06:53: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
the rate of change of potential difference across capacitor is 5×10^2 v/s . if capacitance is 2uF ,then displacement current between it's plate is ?
Asked by pushpakumari291279 | 01 Oct, 2021, 11:08: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
Sir , if a magnetic field is increasing in a cylindrical volume at a constant rate. then what will be direction of instantaneous acceleration experienced by an electron placed inside cylinder but not on center?
Asked by yashrajgharte24.12dgatl | 24 Sep, 2021, 04:21: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
why the flux of magnetic field over a closed surface always zero?
Asked by yashrajgharte24.12dgatl | 24 Aug, 2021, 07:23: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
My Class Videos Tests ₹ Plans Ask a Doubt
Get Latest Study Material for Academic year 24-25 Click here
×