Target Exam

CUET

Subject

Physics

Chapter

Moving Charges and Magnetism

Question:

The terminal voltage of a cell connected to an external resistance R is

Options:

always less than its e.m.f.

          

always equal to its e.m.f.

 always greater than its e.m.f.

 greater of less than its e.m.f. depending on the direction of the current through it

Correct Answer:

 greater of less than its e.m.f. depending on the direction of the current through it

Explanation:

V = E – lr when cell is being discharged

    = E + lr when the cell is being charged.