PHY132_Formulae_M1

# PHY132_Formulae_M1 - Electric Charge Q[C Current I dQ/dt I...

This preview shows pages 1–2. Sign up to view the full content.

Formulae: Electric Charge Q [C] : Q e = 1.602×10 –19 C = e, Q p = e, m e = 9.11×10 –31 kg, m p = 1.67×10 –27 kg Current: I dQ/dt Unit: Ampere A C/s I = qn q Av drift ; v drift E q is the charge of the mobile charges, n q their density, A the wire’s cross section, E the local electric field strength Coulomb Force: Force between two point-charges Q 1 and Q 2 separated by distance r 12 Force exerted by Q 1 on Q 2 , r 12 points from 1 to 2 92 2 1 2 2 2 12 1 on 2 0 2 01 2 0 11 , 8.998 10 Nm /C , 8.85 10 C /(Nm ) 44 QQ r   Fr Electric Field (Vector Field!): E F E / q Force-per-unit-test-charge: N/C Field of a point charge Q Field outside a spherically symmetric charge Q ( r>R ) 2 0 force on charge : 1 , 4 q q Q q r  Er FE Field of a line charge λ =Q/L Field outside ( r n >R ) a cylindrically symmetric charge λ 0 1 ( is unit vector ormal to the line) 2 n n n r r Field of a planar charge σ =Q/A ; for infinite plane, or close compared to the size of the plane… 0 normal to the plane) 2

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 2

PHY132_Formulae_M1 - Electric Charge Q[C Current I dQ/dt I...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online