An electric field of 1500 Vm-1 and a magnetic field of 0.40 Wbm-2 act on a movirig electron. The minimum uniform speed along a straight line, the electron could have is

Question

An electric field of 1500 Vm-1 and a magnetic field of 0.40 Wbm-2 act on a movirig electron. The minimum uniform speed along a straight line, the electron could have is (A) 1.6 × 1015ms-1  (B) 6 × 10-16ms-1 (C) 3.75 × 103 ms-1  (D) 3.75 × 102 ms-1

Tardigrade Admin · Accepted Answer

When electron moves in both electric and magnetic fields then, qE=qvB v= (E/B)= (1500/0.40) =3750 ms-1 v=3.75 × 103ms-1

Q. An electric field of 1500 $V m^{- 1}$ and a magnetic field of
0.40 $Wb m^{- 2}$ act on a movirig electron. The minimum
uniform speed along a straight line, the electron could
have is

$1.6 \times 1 0^{15} m s^{- 1}$

$6 \times 1 0^{- 16} m s^{- 1}$

$3.75 \times 1 0^{3} m s^{- 1}$

$3.75 \times 1 0^{2} m s^{- 1}$

When electron moves in both electric and magnetic fields
then,
$qE = q v B$
$v = \frac{E}{B} = \frac{1500}{0.40}$
$= 3750 m s^{- 1}$
$v = 3.75 \times 1 0^{3} m s^{- 1}$

Q. An electric field of 1500 Vm−1 and a magnetic field of 0.40 Wbm−2 act on a movirig electron. The minimum uniform speed along a straight line, the electron could have is

1.6×1015ms−1

6×10−16ms−1

3.75×103ms−1

3.75×102ms−1