Question

A uniform but time varying magnetic field exists in cylindrical region and directed into the paper. If field decrease with time and a positive charge placed at any point inside the region. Then it moves –

• A. Along 1
• B. Along 2
• C. Along 3
• D. Along 4

Answer 1

Answer: (C)

Along 3

Answer 2

$\frac { \mathrm { dB } } { \mathrm { dt } }$

E × 2πr = + πr² × $\frac { \mathrm { dB } } { \mathrm { dt } }$ = –ve

E = +ve

∴ assume direction is right

so q charge move along 3.