Physics
Assertion (A) : The direction of induced current is such that it opposes the cause which produces it.
Reason (R) : A current is induced in the coil if there is a change in the magnetic flux linked with the coil.
- both A and R are true and R is the correct explanation of A
- both A and R are true and R is not the correct explanation of A
- assertion is false but reason is true
- assertion is true but reason is false
Answer
both A and R are true and R is not the correct explanation of A
Explanation
Assertion (A) is true. Lenz’s Law states that the induced current opposes the cause producing it
Reason (R) is true. From Faraday’s law, which says a current is induced in a coil when there is a change in magnetic flux linked with the coil. However, Reason (R) is not the direct explanation of Assertion (A) because R explains the condition for induction, not the direction.
Related Questions
Which of the following circuits have the same resistance ?
i
ii
iii
iv
- (i) and (ii)
- (ii) & (iii)
- (i) & (iii)
- (ii) & (iv)
Three bulbs of equal resistance are connected as shown in figure. Out of the following statements which one is correct ?
- The current at B is greater than that at C.
- The current at A equals the current at B.
- The current at C is greater than that at B.
- The current at A equals the current at C.
Two blocks P and Q of different metals having their masses in the ratio 3 : 2 are given the same amount of heat. Their temperature rise by the same amount. The ratio of their specific heat capacities is :
- √3 : √2
- 9 : 4
- 2 : 3
- 3 : 2
The temperature of a substance on heating rises because :
- average potential energy of molecules increases
- average kinetic energy of molecules increases
- average kinetic energy of molecules decreases
- average potential energy of molecules remains the same