Question

A, B, C, D, P and Q are points in a uniform electric field. The potentials at these points are V(1) = 2 volt. V (P) = V (2) = V (4) = 5 volt. V (3) = 8 volt. The electric field at P is-

• A. 10 V m^–1 along PQ
• B. 5 V m^–1 along PC
• C. 15√2 V m^–1 along PA
• D. 5 V m^–1 along PA

Answer 1

Answer: (C)

15√2 V m^–1 along PA

Answer 2

$\overrightarrow { \mathrm { M } }$ = – I₀ × 4 × 10^–4

Torque =

= – I₀ × 4 × 10^–4 × $[ 4 \hat { i } + 3 \hat { j } ]$

= – I₀ × 4 × 10^–4 × + I₀ × 4 × 10^–4 × $3 \hat { i }$

t = I₀ × 4 × 10^–4 $[ - 4 \hat { \mathrm { j } } + 3 \hat { \mathrm { i } } ]$

\ unit vector =