4. Select the correct statements in the following list. a) If you connect two id

Question

4. Select the correct statements in the following list.

a) If you connect two identical storage batteries together in parallel, and place them in a circuit, the combination will provide twice the voltage.

b) An electric current produces magnetic field.                    

c) As more and more capacitors are connected in parallel, the equivalent capacitance of the combination decreases.                      

d) A charged particle moves across a constant magnetic field. The magnetic force on this particle causes the particle to accelerate.          

e) As more resistors are added in parallel to a constant voltage source, the power supplied by the source decreases.         

f) A horizontal wire carries a current straight toward you. From your point of view, the magnetic field caused by this current circles the wire in a counter-clockwise direction    

g) A resistor and a capacitor are connected in series to an ideal battery of constant terminal voltage. At the moment contact is made with the battery, the voltage across the capacitor is zero.  

h) A particle carrying a charge of +e travels in a circular path in a uniform magnetic field. If instead the particle carried a charge of +2e, the radius of the circular path would have been one-half the original radius.       

i) The voltage across the terminals of a battery when a current flows is called the electromotive force.

Explanation / Answer

a)it is wrong because voltage eqaul to the voltage of one battery

b)it is correct

c)it is wrong because c=c1+c2+c3 in parallel

d)it is corrct when charged particle does not moves in the direction of the field

e)it is wrong because,P=v2/R in parallel the resistance decreases so power increases

f)it is correct because of right hand thumb rule

g)it is correct because V=Q/C at the given moment Q=0

h)it is correct because radius is inversely proportional to charge.

i)it is correct

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