<h2>The force experienced is 8 x 10⁻¹⁸ N</h2>
Explanation:
When any charge moves into the magnetic field , it experiences the force
The force can be calculated by the relation F = q v B sinθ
here q is the charge and v is its velocity .
B is magnetic field strength and θ is the angle between field and velocity vectors .
Thus F = 1.6 x 10⁻¹⁹ x 200 x 0.5 x sin 30
= 8 x 10⁻¹⁸ N
Answer:
Explanation:
Given
Work required 
Work done to eject the sodium ion from interior of the cell is given by the product of charge and Potential difference between inner and outer surface of the cell.

Charge on sodium ion 

Answer:
f = 15 N
Explanation:
It is given that, when you push with a horizontal 15-N force on a book that slides at constant velocity, a frictional force also acts on it. Frictional force is an opposing force. The magnitude of applied force and frictional forces are same. So, the force of friction on the book is equal to 15 N.