PhysicsNEET 2021Force on a moving charge and on a current

Moving Charges and Magnetism

In the product

$F = q (v \times B) = q v \times (B \hat{i} + B \hat{j} + B_{0} \hat{k})$

for $q = 1$ and $v = 2 \hat{i} + 4 \hat{j} + 6 \hat{k}$ and $F = 4 \hat{i} - 20 \hat{j} + 12 \hat{k}$ , what will be the complete expression for $B$ ?

A. $- 8 \hat{i} - 8 \hat{j} - 6 \hat{k}$
B. $- 6 \hat{i} - 6 \hat{j} - 8 \hat{k}$ ✓
C. $8 \hat{i} + 8 \hat{j} - 6 \hat{k}$
D. $6 \hat{i} + 6 \hat{j} - 8 \hat{k}$

You have the answer. The worked solution — and why the other three were written — is part of a paid pack.

Moving Charges and Magnetism

More from this chapter in past papers