An electric technician requires a capacitance of `2 mu F` in a circuit across a P.D. of 1 kV. A large number of `1 muF` capacitors are available to him each of which can withstand a P.D. of not more than 400 V. Suggest a possible arrangement that requires a minimum number of capacitors.

An electrical technician requires a capacitance of 2 muF in a circuit across a potential difference of 1 kV. A large number of 1 muF capacitors are available to him each of which can withstand a potential difference of not more than 400 V. Suggest a possible arrangement that requires the minimum number of capacitors.

A farmer mixes two brands P and Q of cattle feed. Brand P, costing Rs 250 per bag, contains 3 units of nutritional element A, 2.5 units of element B and 2 units of element C. Brand Q costing Rs 200 per bag contains 1.5 units of nutritional element A, 11.25 units of element B and 3 units of element C. The minimum requirements of nutrients A,B and C are 18 units, 45 units and 24 units respectively. Determine the number of bags of each brand which should be mixed in order to produce a mixture having a minimum cost per bag? What is the minimum cost of the mixture per bag?

A parallel plate capacitor is to be designed with a voltage rating 1 kV, using a material of dielectric constant 3 and dielectric strength about 10^7 Vm^-1 . (Dielectric strength is the maximum electric field a material can tolerate without breakdown, i.e., without starting to conduct electricity through partial ionisation.) For safety, we should like the field never to exceed, say 10% of the dielectric strength. What minimum area of the plates is required to have a capacitance of 50 pF?

Direction. In the follwing questions, a statement of assertion is followed by a statement of reason. While answering a question, you are required to choose the correct are out of the given four responses and mark it as (A). If both assertion and reason are true and reason is the correct explanation of the assertion, (B) if both assertion and reason are true but reason is not correct explanation of the assertion. (C) if asssertion is true, but reason if false, (D) if both assertion and reason are false Assertion : A capacitor blocks d.c. Reason : The capacitive reactance is given by X_C = 1/(2pifc) and for d.c., f = 0

Direction. In the follwing questions, a statement of assertion is followed by a statement of reason. While answering a question, you are required to choose the correct are out of the given four responses and mark it as (A). If both assertion and reason are true and reason is the correct explanation of the assertion, (B) if both assertion and reason are true but reason is not correct explanation of the assertion. (C) if assertion is true, but reason if false, (D) if both assertion and reason are false Assertion : In a transformer, the number of turns in the primary and secondary coils are 500 and 1,250 respectively. If the current in primary coil is 2 A, then the current in secondary coil will be 5 A. Reason : The current in secondary coil is given by I _ s = Ip xx (N_s)/(N_P)

A circuit has a section AB as shown in Fig. HQ 7. The emf of the source equals E = 10V, the capacitor capacitances are equal to C_1 = 1.0 muF and C_2 = 2.0 muF and the potential differences V_A - V_B = 5.0 V . Find the voltage across each capacitor.

The capacitance of a variable radio capacitor can be cahanged from 50pF to 200pF by turning the dial from 0^(@) to 180^(@) . With the dial set at 180^(@) , the capacitor is connected to a 400V battery. After cahrging, the capacitor is disconnected from the battery and dial is tuned at 0^(@) ? (a) what is the p.d. across the capacitor when dial reads 0^(@) ?

Capacitors P,Q,R each have capacitance C.A battery can charge the capacitor P to a potential difference V,If after charging P, the battery is disconnected from it n the charged capacitor P is connected in the following separate cases to Q n R . 1 to Q in parallel​,2 to R in series.Then what will be the potential difference between the plates of P in these two cases?

Number of ways in which three numbers in A.P. can be selected from 1,2,3,..., n is a. ((n-1)/2)^2 if n is even b. ((n-2)/4)^ if n is even c. ((n-1)/4)^2 if n is odd d. none of these