JEE PYQ: Magnetic Effects Of Current Question 47
Question 47 - 2019 (11 Jan 2019 Shift 1)
In an experiment, electrons are accelerated, from rest, by applying a voltage of $500$ V. Calculate the radius of the path if a magnetic field $100$ mT is then applied.
(1) $7.5 \times 10^{-3}$ m
(2) $7.5 \times 10^{-2}$ m
(3) $7.5$ m
(4) $7.5 \times 10^{-4}$ m
Show Answer
Answer: (4) $7.5 \times 10^{-4}$ m
Solution
$r = \frac{1}{B}\sqrt{\frac{2mV}{e}} \approx 7.5 \times 10^{-4}$ m.
BETA
