Question
The balance point in a potentiometer for a cell of emf
1.5 V is 60 cm. If a resistance of 5 Ω is connected in parallel with the cell and the new balance point shifts to 50 cm, what is the internal resistance of the cell?Solution
Let E be the emf of the cell and r be its internal resistance. In the first case, the balance point is at l ₁ = 60 cm. The potential difference across the balance point is proportional to the emf of the cell: E ∝ l ₁ E = kl ₁ , where k is the potential gradient. 1.5 = k × 60 k = 1.5/60 = 1/40 …(1) In the second case, a resistance R=5Ω is connected in parallel with the cell. The effective voltage across the potentiometer wire is now the terminal voltage V of the cell. 
The internal resistance of the cell is 1Ω.
How many such consonants are there in the above arrangement each of which is immediately followed by a consonant and also immediately preceded by a symbol?
Select the term that is different from the other options.
Which of the following element is exactly in the middle of third element from the right end and the tenth element from the left end of the arrangement?
Select the letter combination of letters that when placed sequentially in the blanks of the given series will complete the series.
4 _ _ 7 _...Select the option that represents the letters that when placed from left to right in the blanks below will complete the given letter series.
L...
The code “wof” represents recommendation of the following word?
Select the option that represents the letters that when placed from left to right in the blanks below will complete the letter series.
U F F...In the given series, how many numbers are immediately preceded by a symbol?
% 9 # V # U 9 H Z + X @ O C 7 J % L $ 6 @ 4 % 6 F 5 & 8 D A $
If all the words are arranged according to the alphabetical series from right to left, then which word is third from the left end?
The largest unit of storage is
Relevant for Exams:
