finding EMF using other EMF values

When a certain potentiometer is used to measure an unknown emf, the standard emf has a value of 1.2076 V . When the standard emf is in the circuit and resistances R_1 and R_2 are adjusted so that no current flows through the galvanometer, the values of R_1 and R_2 are 2.42 Omega and 4.84 Omega , respectively. When the unknown emf is in the circuit, the value of R_2 is 3.66 Omega . What is the value of the unknown emf ?

The value of alternating emf E in the given circuit will be

Internal resistance of battery of emf 2E is R_1 and battery of emf E is R_2 . If the potential difference across the cell of emf 2E is zero, then value of R is

Assertion The average value of alternating emf is 63.39% of the peak value . Reason The rms value of alternating emf is70.72% of peak value

Motional EMF

The EMF of a cell is

Motional EMF

Motional EMF

Motional EMF