JEE PYQ: Magnetic Effects Of Current Question 46
Question 46 - 2019 (09 Jan 2019 Shift 2)
A particle having the same charge as of electron moves in a circular path of radius $0.5$ cm under the influence of a magnetic field of $0.5$ T. If an electric field of $100$ V/m makes it to move in a straight path then the mass of the particle is:
(1) $9.1 \times 10^{-31}$ kg
(2) $1.6 \times 10^{-27}$ kg
(3) $1.6 \times 10^{-19}$ kg
(4) $2.0 \times 10^{-24}$ kg
Show Answer
Answer: (4) $2.0 \times 10^{-24}$ kg
Solution
$v = E/B = 200$ m/s. $m = \frac{qBr}{v} = 2.0 \times 10^{-24}$ kg.
BETA
