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Physics – Formulae Sheet

(i) Comparison of emf

1 2



1

  

(ii) Internal resistance of cell r  

2

1 2

  1  R 

18. MOVING CHARGES AND MAGNETIC FIELD S.No. 1.

2.

3.

Situation

Formula

q[E  v  B]

Lorentz force Condition for a charged particle to go undeflected in a cross electric and magnetic field A charge particle thrown perpendicular to uniform magnetic field (i) Path



E B

(i) Circular (ii) r 

mv qB

(iii) t 

2m qB

(ii) Radius (iii) Time period 4.

A charge particle thrown at some angle to a uniform magnetic field

(i) Helix

mv sin  qB

(ii) r 

(i) Path (ii) Radius

(iii) t 

(iii) Time period (iv) Pitch 5.

6.

2m qB

(iv) T  v cos 

Cyclotron frequency

f

Maximum kinetic energy of a charged particle in a cyclotron (With R as radius of dee)

28

K

qB 2m

q2B2R 2 2m